Vintage GEM Electronics Diamond Tester Diatest 2000 Spurious Electric in box

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Vintage GEM Electronics Diamond Tester Diatest 2000 Spurious Electric in box:
$49.99

Vintage GEM Electronics Diatest 2000 Diamond Tester in box. Don\'t know much about this guy uses thermal conductivity to test diamonds. Must be plugged in to operate. I did test with a diamond and it appeared to work correctly, but I wasn\'t sure how accurate or if any damage would occur if not used correctly so this was only briefly operated. That being said, it\'s being sold completely as/is. It\'s vintage and I may not know what I was doing. Looks like something out of an old James Bond film!