Test pencil

Abstract

The utility model provides a test pencil, which relates to the technical field of electricity testing and comprises a first shell, a second shell, a circuit board, an induction piece and a screw piece. A first opening is formed in one end of the first shell; the second shell seals the first opening, the second shell is connected with the first shell and defines a containing cavity, the circuit board is arranged in the containing cavity, one end of the induction piece is connected with the circuit board, the end, away from the circuit board, of the induction piece extends to the position of the second shell, and the screw piece is connected with the end, away from the first opening, of the first shell. According to the utility model, the circuit board and the induction member are installed in the installation cavity, so that the function of detecting voltage and current is realized when the second shell of the test pencil is close to the electrified conductor, and the screw member and the induction member are separately arranged, thereby avoiding the influence on the electricity testing function of the induction member when the screw member is damaged. The screw piece is installed at one end of the first shell away from the sensing piece and is convenient to use independently.

Description

Technical Field

[0001] This utility model relates to the field of electrical measurement technology, and more specifically, to an electrical testing pen. Background Technology

[0002] A test pen is a tool used to detect whether electrical equipment such as wires, sockets, and switches are live. The testing circuit of a common test pen is connected by a screwdriver. When the screwdriver is damaged, it may affect and hinder the test pen's testing performance, causing it to fail to perform its testing function. Utility Model Content

[0003] The purpose of this utility model is to provide a voltage tester that avoids the impact of screw damage on the voltage testing function of the sensing element, extends the service life of the voltage tester, and makes the screw easy to use independently, thus improving the user experience.

[0004] The first aspect of this utility model provides a voltage tester, which includes:

[0005] A first housing, wherein a first opening is provided at one end of the first housing;

[0006] A second housing, which closes the first opening and is connected to the first housing to define a receiving cavity;

[0007] A circuit board, wherein the circuit board is disposed within the receiving cavity;

[0008] A sensor, one end of which is connected to the circuit board, and the other end of which extends away from the circuit board to the position of the second housing;

[0009] A screw component is connected to the end of the first housing away from the first opening.

[0010] In one possible embodiment of this utility model, the test pen further includes a display and a fixing member. The fixing member is connected to one side of the circuit board, the display is disposed between the fixing member and the circuit board, and the side of the display facing away from the fixing member is connected to the circuit board. The third opening of the fixing member corresponds to the display.

[0011] In one possible embodiment of the present invention, the test pen further includes a backlight component, which abuts between the display component and the circuit board.

[0012] In one possible embodiment of the present invention, a first transparent portion is provided on the side of the first housing, and the first transparent portion corresponds to the display element.

[0013] In one possible embodiment of the present invention, the test pen further includes a battery cover and a battery, the battery being electrically connected to the circuit board, a fourth opening being provided on the side of the first housing, the battery cover being disposed on the fourth opening, and the battery being able to be removed from the first housing through the fourth opening.

[0014] In one possible embodiment of this utility model, the test pen further includes a lamp holder and a lamp element. The second housing is provided with at least a second transparent portion. The lamp holder is snapped into the circuit board. The lamp holder is provided with a mounting groove. The lamp element is assembled and positioned in the mounting groove. The lamp element is connected to the circuit board and is positioned facing the second transparent portion.

[0015] In one possible embodiment of this utility model, a light guide is provided on the side of the second housing close to the first housing, and the light guide is sleeved on the lamp holder to form a light path channel.

[0016] In one possible embodiment of this utility model, a sliding groove is provided inside the first housing along a first direction, and the circuit board is slidably connected to the sliding groove. The first direction is the height direction of the test pen.

[0017] In one possible embodiment of this utility model, the screw component includes a screw seat and a screwdriver. The first housing has a second opening at one end away from the first opening. The screw seat closes the second opening, and the screwdriver is connected to the side of the screw seat opposite to the first housing.

[0018] In one possible embodiment of the present invention, the test pen further includes a third housing, which is detachably connected to the end of the first housing away from the second housing. The screw is located inside the third housing, and the third housing is provided with a hanging member.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: The voltage tester provided by this utility model has a first housing and a second housing connected and installed to form a receiving cavity. The circuit board and the sensing element are installed in the mounting cavity. When the voltage tester is used to detect voltage and current, when the second housing of the voltage tester is brought close to a charged conductor, the sensing element of the voltage tester can sense the change in electric field. The sensing element transmits the sensed signal to the circuit board for processing and output to realize the function of detecting voltage and current. The screw is set separately from the sensing element to avoid the impact of the sensing element's voltage measurement function when the screw is damaged, thereby extending the service life of the voltage tester. The screw is installed at the end of the first housing away from the sensing element for easy independent use, thereby improving the user experience. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the voltage tester provided in some embodiments of the present invention. Figure 1 ;

[0022] Figure 2 This is a three-dimensional structural diagram of the voltage tester provided in some embodiments of the present invention. Figure 2 ;

[0023] Figure 3 This is a cross-sectional view of the test pen provided in some embodiments of the present invention;

[0024] Figure 4 This is a schematic diagram of the three-dimensional assembly structure of the voltage tester provided in some embodiments of this utility model. Figure 1 ;

[0025] Figure 5 This is a schematic diagram of the three-dimensional assembly structure of the voltage tester provided in some embodiments of this utility model. Figure 2 ;

[0026] Figure 6 This is a three-dimensional structural diagram of the second housing of the voltage tester provided in some embodiments of the present invention. Figure 2 .

[0027] Explanation of key component symbols;

[0028] 100-Testing pen; 110-First housing; 111-First opening; 112-First transparent part; 113-Second opening; 114-Battery cover; 115-Battery; 116-Slide groove; 120-Second housing; 121-Second transparent part; 122-Light guide; 130-Circuit board; 140-Sensing element; 150-Screw; 151-Screw seat; 152-Screwdriver; 160-Receiving cavity; 171-Display element; 172-Fixing element; 1721-Third opening; 173-Backlight element; 181-Lamp holder; 1811-Mounting slot; 190-Third housing; 191-Hanging element; X-First direction. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] refer to Figures 1 to 3 As shown, an embodiment of this application provides a voltage tester 100, which includes a first housing 110, a second housing 120, a circuit board 130, a sensor 140, and a screw 150.

[0037] Specifically, in combination Figure 3 and Figure 4 As shown, the first housing 110 has a first opening 111 at one end. The second housing 120 closes the first opening 111 and is connected to the first housing 110, defining a receiving cavity 160. The circuit board 130 is disposed within the receiving cavity 160. One end of the sensor 140 is connected to the circuit board 130, and the end of the sensor 140 away from the circuit board 130 extends to the position of the second housing 120. The screw 150 is connected to the end of the first housing 110 away from the first opening 111. Accordingly, the first housing 110 and the second housing 120 are connected and installed to form the receiving cavity 160. The circuit board 130 and the sensor 140 are installed in the mounting cavity. For example, the circuit board 130 can be a PCBA printed circuit board 130.

[0038] In this embodiment, when the voltage tester 100 is used to detect voltage and current, when the second housing 120 of the voltage tester 100 is brought close to a charged conductor, the sensing element 140 of the voltage tester 100 can sense the change in electric field. The sensing element 140 transmits the sensing signal to the circuit board 130 for processing and output to realize the function of detecting voltage and current. The screw 150 is set separately from the sensing element 140 to avoid the impact of damage to the voltage measurement function of the sensing element 140, thereby extending the service life of the voltage tester 100. The screw 150 is installed at the end of the first housing 110 away from the sensing element 140 for easy use by one.

[0039] It is understandable that the sensing element 140 of the test pen 100 adopts a non-contact electrical measurement method. Non-contact electrical measurement is based on the capacitive coupling effect. When the test pen 100 is close to a charged conductor, it will sense the change in the surrounding electric field. Even without direct contact, a tiny capacitor will be formed between the charged conductor and the test pen 100. Air or other insulating materials act as the dielectric. The voltage on the charged conductor will generate a small current in this capacitor. The built-in circuit will detect this weak current and amplify it through the circuit board 130. After a series of signal processing (such as filtering, rectification, etc.), the electrical signal is converted and displayed. That is, the circuit board 130 of this application processes the voltage value collected and detected by the sensing element 140 in a non-contact manner.

[0040] It should be noted that the reference Figure 3 and Figure 4 As shown, the test pen 100 has a first direction X. For example, the first direction X is defined as the height direction of the test pen 100. It is understood that the above definitions are only for ease of understanding the relative positional relationships of the various parts of the test pen 100 and should not be construed as limitations on this application.

[0041] In one embodiment, alternatively, referencing Figure 4 and Figure 5 As shown, the voltage tester 100 also includes a display element 171 and a fixing element 172. The fixing element 172 is connected to one side of the circuit board 130. The display element 171 is disposed between the fixing element 172 and the circuit board 130, and the side of the display element 171 facing away from the fixing element 172 is connected to the circuit board 130. The third opening 1721 of the fixing element 172 corresponds to the display element 171. In other words, the fixing element 172 is used to fix and assemble the display element 171 to prevent the display element 171 from being loosely connected and to ensure the display effect of the display element 171. The display element 171 can display the corresponding voltage intensity indicator according to the intensity of the detected voltage obtained by the circuit board 130, so that the user can intuitively display the voltage intensity detected by the voltage tester 100.

[0042] Optionally, refer to Figure 5 As shown, the test pen 100 also includes a backlight 173, which abuts between the display 171 and the circuit board 130. The backlight 173 is used to provide a uniform light source to illuminate the display 171.

[0043] Optionally, such as Figure 4 As shown, a first transparent portion 112 is provided on the side of the first housing 110. The first transparent portion 112 corresponds to the display element 171. The first transparent portion 112 of the first housing 110 facilitates the display element 171 to display the measurement values ​​and usage status.

[0044] In one embodiment, such as Figure 3 and Figure 4 As shown, optionally, the voltage tester 100 further includes a battery cover 114 and a battery 115. The battery 115 is electrically connected to the circuit board 130. A fourth opening is provided on the side of the first housing 110. The battery cover 114 is placed over the fourth opening, and the battery 115 can be removed from the first housing 110 through the fourth opening. The battery 115 is used to power the voltage tester 100. The battery cover 114 can be installed in the fourth opening of the first housing 110, or the battery cover 114 can be removed from the fourth opening to facilitate the user to replace the battery 115.

[0045] In one embodiment, reference Figure 2 and Figure 5 As shown, optionally, the test pen 100 further includes a lamp holder 181 and a lamp element. The second housing 120 is provided with at least a second transparent portion 121. The lamp holder 181 is engaged with the circuit board 130. The lamp holder 181 is provided with a mounting groove 1811. The lamp element is assembled and positioned within the mounting groove 1811. The lamp element is connected to the circuit board 130, and the lamp element is positioned facing the second transparent portion 121. Correspondingly, the lamp holder 181 is mounted on the circuit board 130, and the lamp element is located within the mounting groove 1811 of the lamp holder 181, so that the light source of the lamp element can face the second transparent portion 121 of the second housing 120, allowing the lamp element to illuminate through the position of the second transparent portion 121. Further, the lamp holder 181 is provided with a slot, through which the lamp holder 181 can be engaged with the circuit board 130.

[0046] In summary, the first housing 110 and the second housing 120 of the voltage tester 100 are connected and installed to form a receiving cavity 160. The circuit board 130 and the sensing element 140 are installed in the mounting cavity. When the voltage tester 100 is used to detect voltage and current, when the second housing 120 of the voltage tester 100 is brought close to a charged conductor, the sensing element 140 of the voltage tester 100 can sense the change in electric field. The sensing element 140 transmits the sensed signal to the circuit board 130 for processing and output to realize the function of detecting voltage and current. The screw 150 is set separately from the sensing element 140 to avoid the impact of damage to the voltage testing function of the sensing element 140, thereby extending the service life of the voltage tester 100. The screw 150 is installed at the end of the first housing 110 away from the sensing element 140 for easy independent use, thereby improving the user experience.

[0047] refer to Figures 1 to 3As shown, an embodiment of this application provides another voltage tester 100, which includes a first housing 110, a second housing 120, a circuit board 130, a sensing element 140, and a screw element 150.

[0048] Specifically, in combination Figure 3 and Figure 4 As shown, the first housing 110 has a first opening 111 at one end. The second housing 120 closes the first opening 111 and is connected to the first housing 110, defining a receiving cavity 160. The circuit board 130 is disposed within the receiving cavity 160. One end of the sensor 140 is connected to the circuit board 130, and the end of the sensor 140 away from the circuit board 130 extends to the position of the second housing 120. The screw 150 is connected to the end of the first housing 110 away from the first opening 111. Accordingly, the first housing 110 and the second housing 120 are connected and installed to form the receiving cavity 160, and the circuit board 130 and the sensor 140 are installed within the cavity. When the voltage tester 100 is used to detect voltage and current, when the second housing 120 of the voltage tester 100 is brought close to a charged conductor, the sensing element 140 of the voltage tester 100 can sense the change in electric field. The sensing element 140 transmits the sensing signal to the circuit board 130 for processing and output to realize the function of detecting voltage and current. The screw 150 is set separately from the sensing element 140 to avoid the impact of damage to the sensing element 140 on the voltage measurement function, thereby extending the service life of the voltage tester 100. The screw 150 is installed at the end of the first housing 110 away from the sensing element 140 for easy use by one.

[0049] In addition, the voltage tester 100 is equipped with a buzzer, which alerts the user to the presence of voltage through sound signals, providing a feedback mechanism and prompting function to ensure that the user can accurately determine whether voltage is present in different environments.

[0050] In one embodiment, alternatively, referencing Figure 4 and Figure 5As shown, the voltage tester 100 also includes a display element 171 and a fixing element 172. The fixing element 172 is connected to one side of the circuit board 130. The display element 171 is disposed between the fixing element 172 and the circuit board 130, and the side of the display element 171 facing away from the fixing element 172 is connected to the circuit board 130. The third opening 1721 of the fixing element 172 corresponds to the display element 171. In other words, the fixing element 172 is used to fix and assemble the display element 171, preventing the display element 171 from being loosely connected and ensuring the display effect of the display element 171. The display element 171 can display the corresponding voltage intensity indicator according to the intensity of the detected voltage obtained by the circuit board 130, so that the user can intuitively display the voltage intensity detected by the voltage tester 100. Figure 5 As shown, the fastener 172 and the circuit board 130 further define a receiving space, so that the display 171 can be assembled and positioned within the receiving space to achieve the purpose of installing and fixing the fastener 172.

[0051] Optionally, refer to Figure 5 As shown, the test pen 100 also includes a backlight 173, which abuts between the display 171 and the circuit board 130. The backlight 173 provides a uniform light source to illuminate the display 171. For example, the display 171 is an LCD panel, which is used in conjunction with the backlight panel. The backlight 173 is the backlight panel, which provides sufficient light to the LCD panel.

[0052] Optionally, such as Figure 4 As shown, a first transparent portion 112 is provided on the side of the first housing 110. The first transparent portion 112 corresponds to the display element 171. The first transparent portion 112 of the first housing 110 facilitates the display element 171 to display the measurement values ​​and usage status.

[0053] In one embodiment, such as Figure 3 and Figure 4 As shown, optionally, the voltage tester 100 further includes a battery cover 114 and a battery 115. The battery 115 is electrically connected to the circuit board 130. A fourth opening is provided on the side of the first housing 110. The battery cover 114 is placed over the fourth opening, and the battery 115 can be removed from the first housing 110 through the fourth opening. The battery 115 is used to power the voltage tester 100. The battery cover 114 can be installed in the fourth opening of the first housing 110, or the battery cover 114 can be removed from the fourth opening to facilitate user replacement of the battery 115. For example, along the first direction X, the battery cover 114 and the first transparent portion 112 are respectively disposed on opposite sides of the first housing 110.

[0054] In one embodiment, reference Figure 2 and Figure 5 As shown, optionally, the test pen 100 further includes a lamp holder 181 and a lamp element. The second housing 120 is provided with at least a second transparent portion 121. The lamp holder 181 is engaged with the circuit board 130. The lamp holder 181 is provided with a mounting groove 1811. The lamp element is assembled and positioned within the mounting groove 1811. The lamp element is connected to the circuit board 130, and the lamp element is positioned facing the second transparent portion 121. Correspondingly, the lamp holder 181 is mounted on the circuit board 130, and the lamp element is located within the mounting groove 1811 of the lamp holder 181, so that the light source of the lamp element can face the second transparent portion 121 of the second housing 120, allowing the lamp element to illuminate through the position of the second transparent portion 121. Further, the lamp holder 181 is provided with a slot, through which the lamp holder 181 can be engaged with the circuit board 130. For example, there are two slots, with the two slots along the first direction X corresponding to the two opposite long sides of the circuit board 130.

[0055] Optionally, combined Figure 2 and Figure 6 As shown, a light guide 122 is provided on the side of the second housing 120 near the first housing 110. The light guide 122 is sleeved on the lamp holder 181 to form a light path channel. That is, the light guide 122, together with the lamp holder 181, can define the light path channel. The light guide 122 can be installed and positioned on the lamp holder 181. The light guide 122 guides and focuses the emitted light source, reduces light scattering, increases the luminous flux, and ensures the lighting quality. It allows the light source emitted by the lamp to illuminate along the light path channel and illuminates the outside through the second transparent part 121. For example, the second transparent part 121 is a convex mirror structure, which focuses the light source emitted by the lamp.

[0056] In another embodiment, the second housing 120 is optionally made of a transparent structure, so that the light source emitted by the lamp can be illuminated through the transparent structure of the second housing 120, ensuring that the user can perform electrical measurement operations and observe the surrounding environment more accurately in a dark environment.

[0057] In one embodiment, reference Figure 2 and Figure 5As shown, optionally, a sliding groove 116 is provided in the first housing 110 along the first direction X, and the circuit board 130 is slidably connected to the sliding groove 116. The first direction X is the height direction of the test pen 100, that is, the sliding groove 116 of the first housing 110 is set along the height direction of the test pen 100. The circuit board 130 can be inserted into the sliding groove 116 of the first housing 110 along the height direction of the test pen 100, or the circuit board 130 can be removed from the sliding groove 116. The sliding groove 116 of the first housing 110 can limit the circuit board 130, reduce the shaking or misalignment of the circuit board 130 in the first housing 110, and ensure the normal operation and use of the relevant components in the test pen 100.

[0058] In one embodiment, reference Figure 4 As shown, optionally, the screw component 150 includes a screw base 151 and a screwdriver 152. The first housing 110 has a second opening 113 at the end away from the first opening 111. The screw base 151 closes the second opening 113. The screwdriver 152 is connected to the side of the screw base 151 opposite to the first housing 110. In other words, the screwdriver 152 can be mounted on the screw base 151, or it can be detached from the screw base 151, so that different sizes of screwdrivers 152 can be replaced according to usage, improving the adaptability of the screw component 150. Of course, the screw base 151 and the screwdriver 152 can be detachably connected. Alternatively, the screw base 151 and the screwdriver 152 can be integrally formed, with one end of the screw base 151 mounted on the second opening 113, and the end of the screwdriver 152 away from the first housing 110 connected to the screwdriver 152.

[0059] In one embodiment, such as Figure 2 As shown, optionally, the test pen 100 further includes a third housing 190, which is detachably connected to the end of the first housing 110 away from the second housing 120. The screw 150 is located inside the third housing 190, and the third housing 190 is provided with a hook 191. Accordingly, the third housing 190 is used to cover the screw 150, so that the third housing 190 protects and accommodates the screw 150. When the screw 150 is not in use, the third housing 190 is installed on the first housing 110, or when the screw 150 needs to be used, the third housing 190 is removed from the first housing 110. The hook 191 on the third housing 190 allows the user to clamp and hang it on a collar or pocket, etc.

[0060] In one embodiment, alternatively, such as Figure 1 and Figure 5As shown, the voltage tester 100 is equipped with several push-button switches, which are connected to the circuit board 130 to facilitate switching the voltage levels and turning the tester 100 on and off. The voltage tester 100 has at least a first level, a second level, and a third level. In the first level, the voltage measurement sensitivity D1 satisfies: 12V ≤ D1 ≤ 1KV. In the second level, the voltage measurement sensitivity D2 satisfies: 70V ≤ D1 ≤ 1KV. For example, the voltage measurement sensitivity is switched by a short press (e.g., the press time is less than or equal to 1 second). The third level is used to turn the lamp on or off (e.g., the press time is greater than or equal to 2 seconds).

[0061] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0062] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A test pen, characterized in that, include: A first housing, wherein a first opening is provided at one end of the first housing; A second housing, which closes the first opening and is connected to the first housing to define a receiving cavity; A circuit board, wherein the circuit board is disposed within the receiving cavity; A sensor, one end of which is connected to the circuit board, and the other end of which extends away from the circuit board to the position of the second housing; A screw component is connected to the end of the first housing away from the first opening.

2. The test pen according to claim 1, characterized in that, It also includes a display component and a fixing component. The fixing component is connected to one side of the circuit board. The display component is disposed between the fixing component and the circuit board, and the side of the display component facing away from the fixing component is connected to the circuit board. The third opening of the fixing component corresponds to the display component.

3. The test pen according to claim 2, characterized in that, It also includes a backlight component, which abuts between the display component and the circuit board.

4. The test pen according to claim 2, characterized in that, The first housing has a first transparent portion on its side, which corresponds to the display element.

5. The test pen according to claim 1, characterized in that, It also includes a battery cover and a battery, the battery being electrically connected to the circuit board, a fourth opening being provided on the side of the first housing, the battery cover being disposed on the fourth opening, and the battery being able to be removed from the first housing through the fourth opening.

6. The test pen according to claim 1, characterized in that, It also includes a lamp holder and a lamp element. The second housing is provided with at least a second transparent portion. The lamp holder is snapped into the circuit board. The lamp holder is provided with a mounting groove. The lamp element is assembled and positioned in the mounting groove. The lamp element is connected to the circuit board and is positioned facing the second transparent portion.

7. The test pen according to claim 6, characterized in that, A light guide is provided on the side of the second housing close to the first housing, and the light guide is sleeved on the lamp holder to form a light path channel.

8. The test pen according to claim 1, characterized in that, A sliding groove is provided inside the first housing along a first direction, and the circuit board is slidably connected to the sliding groove. The first direction is the height direction of the test pen.

9. The test pen according to any one of claims 1 to 8, characterized in that, The screw assembly includes a screw base and a screwdriver. The first housing has a second opening at one end away from the first opening. The screw base closes the second opening. The screwdriver is connected to the side of the screw base opposite to the first housing.

10. The test pen according to claim 9, characterized in that, It also includes a third housing, which is detachably connected to the end of the first housing away from the second housing, the screw is located inside the third housing, and the third housing is provided with a hook.

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