The Presidium Analog Dial Gauge delivers precision gemstone measurement without electronic components. This professional-grade instrument simultaneously displays millimeter dimensions, carat weight estimates for round brilliant diamonds, and US ring sizes on a single easy-to-read dial. Its patented anvil design and friction-free rack-and-pinion mechanism ensure consistent accuracy across measurements from 0.0 to 23.0mm. The gauge accommodates ring sizes 2-13 and carat weights up to 3.65, making it indispensable for jewelers and gemologists. Includes a high-setting attachment, protective carrying case, and comprehensive gemstone weight reference guide. Built to exacting standards with no batteries required and backed by a one-year manufacturer's warranty.
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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 |