Presidium Gemstone Tester PGT II

Presidium gem tester.. don't know much about it, they don't make them anymore and I can't find anybody that repairs them. It turns on but isn't reading properly. Can anyone direct me

Testing created frosted #quartz with my Presidium Gem Tester II. The results may surprise you. #presidium #semipreciousgemstones #presidiumgemtester, By Gentle Angel Treasures

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jewelry tool presidium gem tester-ii colored

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Given to me in early 1980s from my Mom. Thought it was glass, but tested with Presidium Gem Tester II and result was in ruby, sapphire range. : r/ Gemstones

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Singapore PRESIDIUM Gem Tester II, testing 16 kinds of gems