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Presidium Gem Thermal Tester II/Coloured Stone Estimator Dial (PGT II) - TD53
Presidium Duo Test Thermal Conductivity Refractive Index Tester (PDT) - TD5310
Presidium ARI Diamond Verification Instrument Moissanite Tester - TD54
Presidium Synthetic (Lab Grown) Diamond Screener II (SDS II) Detector - TD5314