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Size of Diamond Stone Testers: The gemstone tester pen diamond gold tester has size about 6.6 inches length and width about 1.6 inches with thickness

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Features:, Easy operation., Accurate and reliable reading., LED light and audio result indication., Simple calibration for stones of various sizes.,

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[INITIALIZATION SETUP] After powering on, turn the wheel to keep 4 green lights on to finish the Initialization. Otherwise you will get inaccurate

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