The application relates to a
detector. The
detector comprises a fixed base, a first
elastic compression wheel, a measuring rod, a second
elastic compression wheel and a first indicating part. The fixed base is arranged to extend along a first direction, and the fixed base is provided with the first
elastic compression wheel at at least one end along the first direction, and the first elastic compression wheel is used for pressing and fixing on a
contact wire. The measuring rod is arranged on the fixed base and can move relative to the fixed base along the first direction and a second direction respectively, and the second direction is perpendicular to the thickness direction of the fixed base. The second elastic compression wheel is arranged on the measuring rod, and the second elastic compression wheel is used for pressing and fixing on another
contact wire. The first indicating part is arranged on the measuring rod, and the first indicating part comprises a plurality of first scales arranged at intervals along the second direction. By using the
detector, one person can operate the detector to measure and adjust the data such as
height difference, so that manpower, time and adjustment accuracy can be saved.