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Retractable thermoelectric probe tip that ensures constant pressure between probe and gemstone Industrys thinnest probe tip (0.6mm) for testing

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Presidium Gem Tester II Review 2023: Should You Buy One?

Presidium Gem Tester II Review 2023: Should You Buy One?

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Presidium Instruments Gem Tester II (PGT II) with

Presidium Gem Tester II Review 2023: Should You Buy One?