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High Accuracy Professional Diamond Tester Pen Gem Selector Jeweler Tool Battery
$10.99, located in Walnut, California, USA (917**), item #266729777515
Turn on the switch,Make sure only 1 light is lighting up on the scale.Wait few seconds for the probe to heat up until Lamp on ready OK.Turn on the lights numbers corresponding to the indoor temperature and diamond weight.If don't know.
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