High Accuracy Diamond Tester Pen+30X60X Illuminated Jewelry Eye Loupe Mini Led Foldable Magnifying,Jewelry Diamond Detector Gem Distinguish Tool Thermal Conductivity Meter for Novice and Expert Features: Diamond indicator will be showed if the stone is a REAL diamond (Green light). Large / small switch for testing diamonds / - 8 points. LCD display & LED indicator. User Manual Included Powered by DC 9V battery x 1 ( Included) 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. Turn on the lights numbers corresponding to the indoor temperature and diamond weight. If don't know. Set 4 lights is lighting up on the scale. Start test diamond, no need to adjust the switch switch. Use the diamond discriminator probe to make 90-degree contact with the measured object, and observe the indicator light change It needs a little bit of force to stop it on the diamond surface and make full contact. If unsuccessful, please repeat the second step. Yhkj Diamond Tester Pen Test result analysis If lights >= 9 and have sounds, it is true diamond. If lights <9 and no sounds, it is not diamond. If lights is 7 or 8, it is true crystal. If lights is 6 or 7, it is true jade. If lights is 4 or 5, it is glass. Don't test metal, Don't wear gloves. In a low temperature environment, the battery discharge is weakened. Please raise the battery temperature to above 10 degrees Celsius. The test takes a few minutes, please turn off the power after the test is complete. Package include: 1 x Jewelry tester 1 x Jewelry loupe Our products are all from factory direct supply, we can guarantee 100% inspection before shipping. If any problems of our products really exist, an exchange or a refund is available.