GemOro Suregauge XL
The portable GemOro SUREgauge XL has a measuring range of 0-25mm/0-1″ with a precision accuracy of 0.01mm/0.0005″. This easy to use gauge also comes with a High Setting attachment, great for measuring stones in ring settings. The LCD digital display is operated with three control buttons, a Blue mm/inch Button, Red on/off button and Yellow Zero Adjustment Setting button. On the top side of the gauge is a locking screw to hold a setting measurement by tightening. This Gauge is powered by two LR Alkaline Batteries (357 Silver Oxide) replaced by opening battery compartment cover on the right top at the arrows and inserting each battery.