PRESIDIUM® Dial Gauge is an analog gauge for measuring gemstone dimensions with direct conversion to carat weight for round brilliant-cut diamonds.
Instant conversion between mm/ct/ring size ◆ Patented anvil ◆ Smooth slider mechanism ◆ No batteries required ◆ One-year manufacturer's warranty ◆ Comes with high-setting attachment, protective case, and gemstone weight estimation booklet.
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. Presidium Dial Gauge is capable of measuring stones from 0.0 to 23.0 millimeters in 0.1 millimeter increments (ring sizes 2 - 13 / 0.01 - 3.65 carats).
The PDG is manufactured to meet Presidium's highest standards of quality control and features a patented anvil with a non-metallic lubrication-free rack and pinion technology that resist wear and tear and maintain accuracy for years.
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| Length (inches) | 97mm (3.82) |
| Width (inches) | 61mm (2.4) |
| Height (inches) | 16mm (0.63) |
| Weight (grams) | 100 |
| Gemstone (mm) | 0.00mm to 23.00mm (0.1mm increment) 1 revolution Equals 10mm |
| Gemstone (carat) | 00.01ct to 3.65ct (0.04ct increment) |
| Ring size (US size) | Size 2 to Size 13 |
| Measures | 0.00 to 23.00 |