Plastic Ring Gauge Universal Coloured

Allows you to estimate the size of diamond without removing it from mounting. Measure girdle diameter and use the conversion booklet provided.

Nickel plated steel with roller adjustment. One edge is graduated in inches reading ½” in ½” in 1/16” divisions and other edge in metric scale from 0 to 120mm in 1mm divisions.

Carbide tipped measuring faces parallel, ground and lapped. Stainless steel spindle for rust prevention, heat resistant grips and calibration is laser etched.

15mm Capacity; Graduations 1 to 10mm; Throat 20mm.