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ground flat and smooth
Featuring a 17° taper angle and 20 graduated hole sizes ranging from 5 mm to 20 mm
giving you ample material for multiple pieces
Maintains firmness over extended use
Presidium PGI Gem Indicator Proxxon ground flat and smoothThe Presidium Gem Indicator (PGI) is the only handheld tester specifically designed for colored gemstones. Using advanced thermal conductivity technology, it can identify up to 31 different gem types and includes a color input function with 12 common gemstone colors for even greater accuracy. A clear digital LED screen ensures easy to read results, while the patented changeable probe tip delivers reliable, long term performance. The PGI is a
