Product descriptionHigh Accuracy Diamond Tester Professional Diamond Tester PenFast and ,Intuitive Design,Simple to UseProfessional Diamond Selector will indicate genuine diamond or fake.It is designed for quick, precise, and diamond testing.Hqdz Diamond Tester Pen is simple to operate to get results, professional(s) are not required. Simply turn on our Diamond Tester Pen detector; place the tip of the Diamond Tester on the gem stone (lightly pressed is sufficient) and If the stone is fake, crystal or cubic zirconia, the tester will not beep.High Accuracy Professional Diamond Tester PenThis gemstone testing equipment is not only a diamond tester, but also a multi gemstone tester. It can detect if a gemstone is real or fake, including: diamond, sapphire, ruby, crystal, agate, jadeite, and other precious stone of various sizes.Bare Hands Operation Diamond Tester PenHow To Use Diamond TesterThe battery temperature is lower than 10 degrees Celsius, which seriously affects the use timeDon't wear glovesDon't detect metalBest to measure in no wind conditionsThe operating temperature is within the range of 10-35 degrees Celsius, and the humidity is below 80%When testing diamond, your right index finger must keep touching the metal panel on the back of the tester.Please turn off the power after the test to save power.High Accuracy Diamond Tester Professional Diamond Jeweler Diamond SelectorHigh Accuracy Diamond TesterDiamond tester penProfessional Jeweler Diamond SelectorHigh Accuracy Diamond Tester Diamond Tester PenHigh Accuracy Diamond Tester Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector 9V Battery Included(Black Diamond Testers)Simple to UseHqdz Diamond Tester Pen Test result analysisIf 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.Professional Diamond Selector II will indicate genuine diamond or fake.It is designed for quick, precise, and diamond testing.High Accuracy Diamond Tester Professional Diamond Jeweler Diamond SelectorHigh Accuracy Diamond Tester Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector 9V Battery Included(Black Diamond Testers)How To Test DiamondTurn 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.