Presidium PGI Gem Indicator NSK Every mandrel is etched with

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

use the lowest-temperature (Extra Easy or Easy) solder available

making it a practical and versatile addition to your studio

Featuring 12 precisely sized bead cavities ranging from 0

Accepts a 7

Presidium PGI Gem Indicator NSK Every mandrel is etched withThe 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