power meter (820)

Abstract

1. The name of the design product: Focal length meter (820). 2. The use of the design product: The instrument is used to measure the top focal length and prism of the spectacle lens, determine the cylinder axis direction of the cylinder lens, print marks on the uncut edge lens and check whether the lens is correctly installed in the frame. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

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