Presidium Gem Tester (PGT) - Performing A Test & Reading
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Presidium Gemstone Tester : : Industrial & Scientific
Presidium DuoTester (PDT) - Diaminor
PRESIDIUM Singapore original imported gem tester / gem testing
Presidium gem tester.. don't know much about it, they don't make
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Jital Good Luck Presidium Diamond Tester for Authenticating
Presidium Instruments Gem Indicator PGI Handheld India