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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 Emit sounds to give accurate reading LCD display & LED indicator If stone is Fake crystal, a simulant such as cubic zirconium ( CZ ), there will be no reaction. Operating methods: Switch on the power, the power indicator light will glow, instrument began preheating, after a few seconds instrument can be used. *Put the stone in the support tray and hold the machine upright. Those stones that are already inlay, need not put in tray hole, you can use it handheld. *According to the weight of the tested diamonds and measuring the temperature, Set the Led. *take down needle sheath, handheld the instruments, the forefinger on conductive plate; make instrument vertical and measured true diamond meke gentle contact of probe on the stone. *carefully watch instrument, if the rest of the emitting diode light reflects yellow, and lights upto nine, accompanig with beeping, this explains those tested are real diamond. By contrast, if lit, and insufficient and not upto nine and no beeping sound, explain fake diamond. 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 box: YES Color: Black Packing content: 1 x Diamond selector II tester 1 x DC 9V battery 1 x Protected leather bag