Scratch-resistant probe head - The top of the probe head is smooth, not easy to wear the lens (with probe protection cover).<br> Stainless steel thread - Fine workmanship, comfortable feel, non-slip and not easy to fall.<br> Scale and pointer - Precisely measure the curvature of the lens, anti-shake pointer, clear data display.<br> For use with both glass and plastic lenses. Quickly identify and check base curve.<br> Precision scale is uncrowded and easy to read.<br> Note:<br> Installation guide not included,Please check as much as possible to make sure the item is what you need.<br> Tips:The product may be updated constantly, Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use.<br> Colour:As Shown<br> Material:stainless steel<br> Package Contents:<br> 1 * Clock Radian Apparatus Gauge<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.