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【Initialization】After powering on, turn the wheel to keep 4 green lights on to finish the Initialization. Otherwise you will get inaccurate results.

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Portable Electronic Diamond Tester Pen For Sapphire, Ruby, Crystal

■【Intuitive Design】Hqdz-td Diamond Tester Pen comes with LED lights and audio indication. During a test, if the stone tested is a diamond, the LED

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Professional High Accuracy Diamond Tester 2 / 3 Gemstone Gem

How To Test Diamond 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.

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Diamond Tester Pen, High Accuracy Jewelry Diamond Tester

This diamond tester has a highly compact design, which can perform fast, accurate, and safe diamond testing, which is very suitable for carrying with you when buying diamonds. This diamond tester will indicate whether your diamond is genuine or fake. You can quickly and easily understand the diamond data. The LED light and audio indication of this diamond tester test the true and false results of the diamond.

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Diamond Gems Tester Pen High Accuracy Diamond Selector

Professional Diamond Selector II, Gem Tester Pen Portable

How Does a Diamond Tester Work: A Clear Explanation