The Presidium Dial Gauge measures up to 23mm in .1mm increments.
The PDG features an easy-to-read millimeter and carat scale, and is the only dial gauge in the industry that combines dual measurements for gemstones in millimeters with corresponding carat conversion for round brilliant-cut gemstones. PDG also contains an inner scale display for US ring size measurements.
The PDG is manufactured to the highest quality and features a patented anvil with a non-metallic lubrication-free rack and pinion technology that resists wear and tear and maintains its accuracy.
Key features include: measures up to 23mm in .1mm increments, carat estimation scale, inner ring sizer dial, patented non-metallic, lubrication-free rack and pinion for smooth feel and long-lasting accuracy, weight estimator booklet