Portable electronic device for distinguishing real diamonds from other simulated stones. It is designed for fast, precise and safe diamond testing. LCD display and LED display. When stone is fake crystal, a simulant like zirconia (CZ), there is no reaction. Powered by DC 9V battery x 1 (not included) Diamond Selector II " is a portable electronic device used to distinguish real diamonds from other simulated stones. It is designed for quick, precise and safe diamond testing. Features: Bag with a handheld. Operation simple and precise. Emit audible tones to give accurate reading. Diamond indicator shows if the stone is a real diamond (green light). Metal alarm (continuous humming sound when user accidentally touches metal instead of stone). Large / small switches for testing diamonds + / - 8 points. To emit sounds to give accurate reading. LCD display and LED display. When stone is fake crystal, a simulant like zirconia (CZ), no reaction occurs. Dimension: 16 x 4 x 2 cm Color: Black Powered by DC 9V battery x 1 (not included) Package include: 1 x diamond tester 1 x user manual