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    Presidium Gem Indicator 31 Colored Gemstones Tester PGI, Digital LED Screen, Pouch, USB Wire
    New with box, pouch and USB wire, no manual. High quality handheld digital tester for 31 types of gemstones. Digital LED screen shows results within 6 seconds. Detects stones based on thermal conductivity and has a 12 colors input function for more accurate results. Easy to change probe tip as needed. This is an enhanced version of the Presidium Gem Tester/Colored Stone Estimator. Three AAA batteries included.

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