Product Review
This is an accurate lens clock to calculate base curves.
The scale will give you the focal length.
Works very accurate and easy to calculate when doing the lenses.
Measuring Range: 0-20mm
Reading: 0.25
Measure Scope: +/-20
Size: 80 x 100 x 28mm
Weight: 142.5g
Package Include:1×Lens Clock Base Curve Measurement