Feature:*100% brand new and high quality*Thermal conductivity meter is based on the thermal conductivity of diamonds designed and manufacturedspecifically for the identification of genuine and false diamond an electronic instrument.*The instrument for precision electronic equipment, the use of the environment for the 5-35 degrees Celsius, air relative humidity at 80%.*The gemstones to be tested must be clean, dry and at room temperature.*Pocket portable handheld.*With LED light and audio result indication.Accurate and reliable reading, with metal alert, testing platform for loose stones.*Non-destructive testing, simple and accurate.*This is Electronic Diamond Tester a portable electronic device for distinguishing real diamonds from other simulated stones.*It is designed for quick, precise, and safe diamond testing, simple calibration for stones of various sizes.Specifications:*Working power: DC9V battery.(not included)*Overall dimensions: 160*40*22mmInstructions:*Open the thermal conductivity meter power supply, the probe heating, generally takes 20 seconds.*The hot needle touches the sample surface, according to the thermal conductivity of the instrument can determine whether the signal is diamonds tested samples.Notice:*DIAMONDS1. Beeping sound (beep-beep-beep)2.(1)1~4 of the Red Lamp box OF the Level Meter,(2)will light on.(More no. of Red Lamp boxes will light up for bigger sized stones.)*DIAMOND SIMULANTS(Except Synthetic Moissanite)1. No Beeping sound.2. No Red Lamp boxes will light on. Green and/or up to Yellow Lamp boxes may light on depending on the type of simulants.)*METAL ALERT1. Continuous buzzing sound.(The thermal conductivity of the metal is very high and can give the same indication as a Diamond with most Thermal Probes.The Diamond Selector II has a Metal Alert buzzer to warn you when the Probe tip touches metal.)If you hear the Metal Alert buzzing sound. re-touch the Probe tip so as to touch only the tested stone.Package List:1 x Diamond selector I