Gemstone and Pearl Hand GaugeA smooth operating, lightweight digital gauge that is ideal for measuring pearls, diamonds, etc. The measuring faces are 15 mm in diameter and are cut half round so the gauge can lie flat, flush with the work table. The gauge is 3" long (75mm) and has a capacity of 0 15mm (0 0. 6") with an accuracy of 0. 01mm (0. 001"). Right handed version is for those who like to hold the gauge in the right hand and the tweezer in the left hand.