Diamond Gems Tester Pen Portable Gemstone Selector Tool LED Indicator Accurate Reliable Jewelry Test Tool1. Turn on the power, the power indicator lights up, the instrument starts to warm up, and the instrument can be used in a few seconds.2. Put the tested bare drill into the appropriate recessed hole of the support tray, with the table top facing up. Those who have been mounted do not need to put it in the tray hole, but can hold it by hand.3. Brighten several light-emitting diodes according to the weight of the measured real and fake diamonds and the temperature of the measuring place.4. Remove the probe sheath, hold the instrument and Press the conductive plate of the back cover of the instrument with your right index finger; make the probe lightly Press the table surface of the measured real and fake diamonds vertically.5. Carefully watch the response of the instrument. If the remaining yellow LEDs light up, when there are 9 diodes, and a buzzer sounds, it means that the testee is a real diamond. Contrary to this, if there are less than 9 lights up and the instrument does not emit a sharp beep, it means a fake diamond or a counterfeit.1. Needle control 2. Three-color indicator light 3. Power indicator light4. Ready indicator light 5. Power switch/adjustment button 6. Battery coverTechnical characteristics:1. Pocket, portable and handheld.2. Non-destructive testing, simple and accurate operation.3. Power supply: DC9V battery.Repair and maintenance:1. The probe of the instrument is very sensitive and must be protected with special care. When not in use, a sheath should be put on.2. When the ready indicator light is very dark, it means the battery will be exhausted and the battery should be replaced in time.3. Please take out the battery if the instrument will not be used for a long time.4. For accurate detection, it is recommended to calibrate once a year.size:162 x 42 x 22MMMaterial:ABScolour:blackPackage Contents:1 x Diamond detectorOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.