Presidium PGI Gem Indicator NSK making it a practical and

making it a practical and versatile addition to your studio

Every mandrel is etched with its size marking for accurate reference at a glance

Featuring 12 precisely sized bead cavities ranging from 0

Accepts a 7

2mm round center stone

Presidium PGI Gem Indicator NSK making it a practical andThe 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