Presidium Duo Tester II (PDT II) - Functionality Check
How to Calibrate Presidium Gem Tester ii (PGT II)
Guide on How to Calibrate Presidium Gem Tester
Carat Scale 100n (PCS-100n) - Calibration
Gem Tester II: Quick Diamond/Moissanite Identification & Colored Gemstone Separation
Presidium Gem Indicator (PGI) Library Function
Gold Karat Tester - Getting Started
Presidium Gem Tester II (PGT II) - Assisted Thermal Calibration
Guide on How to Calibrate Presidium Gem Tester
Did I REALLY Find Diamonds at the Car Boot Sale? Diamond Selector II Vs Presidium Gem Tester II
praesidium ELECTRONIC GEM GEMSTONE DIAMOND TESTER PGT
เครื่องตรวจเพชร Presidium Multi Tester III (PMuT III)
Presidium Duo Tester - Battery Insertion & Switching On