brand new and high quality.brand new and high quality.Quantity: 1pc Color: Black Size: 13.5cmx4cmx2cm/5.31x1.57x0.79in (approx) Diamond Tester: * 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. * Power supply: for DC 9V battery (The battery is not Included ). Operating Methods: Open the power, the power indicator light, instrument began preheating, after a few seconds instrument can be used. Take the for naked drill will be tested into 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; for 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.Note: The battery is not included.