Features: Easy to use even for a new beginner Emit audible sounds to give accurate reading Diamond indicator will be showed if the stone is a REAL diamond (Green light) Metal alert (continuous buzzing sound when user accidentally touches metal rather than stone ) Large / small switch for testing diamonds +/ - 8 points To emit sounds to give accurate reading LCD display & LED indicator If stone is Fake crystal, a simulant such as cubic zirconium ( CZ ), will be no reaction Operating methods: open the power, the power indicator light, instrument began preheating, after a few seconds instrument can be used.*Take the naked drill will be testedinto support tray appropriate sunken hole, and its mesa upwards. Those already inlay, need not put tray hole in ，you can using handheld its.*according to the weight of the tested diamonds and measuring the temperature place move bright several leds.*take down needle sheath, handheld instruments, the forefinger of conductive plate; touch instrument back cover That probe vertically and measured true diamond mesa gently contact.*carefully watching instrument, if the rest of the emitting diode light reflect yellow, when light to nine diode, accompany beeping this explains those tested for a real diamond. By contrast, if lit, and insufficient nine instrument does not send feng chirp, explain fake diamond or ape. Specification: Dimension: 16.5 x 4.2 x 2.2cm Powered by DC 9V battery x 1 ( included ) Weight: 155g(including battery) Package Weight: 170g Original : YES Color: Black Packing content: 1 x Diamond selector II tester 1 x DC 9V battery 1 x Protected leather bag Please download the USER GUIDE in : https://.com/s/aadf85a4f0525b3f20e0