比例放大玻璃7倍（包括1）（1975+1SL-7X

[功能]
●一种结合镜头和比例尺的简单真实的光学测量设备。
●This Kernell type has two groups and three pieces that removes various aberrations as much as possible, with focus adjustment wheel included
●Comes with scale plate No. 1
[Specifications]
●Enlargement ratio: 7X
●Field of view (mm): 24φ
●Effective diameter (mm): 18φ
●Measurement object/scale plate:长度，角度，R测量
●测量范围/比例板（mm）：±10
●1div/scale板（mm）：0.1
●尺寸（mm）：36φ×57
●重量（g）：56：56：56