Has Nylon ball tips which will not scratch lenses. Balance point is centered on cushioned grips. Accommodates lens blanks of over 90mm diameter and 22mm in thickness. 1/10mm Vernier gauge is included for accurate measurements. Overall length is 9-3/4 inches with a throat depth of 47mm. 

Tips can also be ordered separately with an additional cost of £5.

Spring can also be ordered with an additional cost of £4. 

Vernier caliper new Length 9". Throat depth: 47mm. Measures lenses up to 90mm across and 22mm thick. Balance point is centered on cushioned grips. Large, easy to read vernier scale.

The item is cheap prices of it quality. We do a lot of other stuff please feel free to ask.