Presidium PGI Gem Indicator Sanding Bands Disc & Sticks controlled cutting action—ideal for knife

controlled cutting action—ideal for knife edges

6" (150 mm) Available Cuts 0 Coarse

200mm (7-7/8") - 4

rubber wheels

Presidium PGI Gem Indicator Sanding Bands Disc & Sticks controlled cutting action—ideal for knifeThe 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