This handy gauge also known as a "Pearl Gauge" because it was first used for measuring pearls. It is also excellent for measuring gem stones of all kinds and comes in a leatherette pouch. Its smooth action assures accuracy. This gauge is made to zero out when closed and open automatically. This assures a gentle force by the user when measuring soft stones and pearls. The dial features "zero adjust" and is accurate to .10 mm. The gauge is compact and fits neatly into a pocket or purse.
- Gemstone MM gauge
- Available in 20mm openings