Presidium Gem Indicator (PGI) Gem Tester, 54-1144
Presidium PGI Gem Indicator
Presidium Instruments Gem Tester II (PGT II) with
Cape Precious Metals - Praesidium Digital Leveridge Gauge
Cape Precious Metals - Presidium Multi Tester
Gemstone Testing Machine Black Presidium Gem Tester Pgt-2, For
Testing jewelry using my Presidium Gem Tester II
Gem Tester II: Quick Diamond/Moissanite Identification & Colored
Gem Tester II: Quick Diamond/Moissanite Identification & Colored