brand new and high quality Features: Easy operation. LED light and audio result indication. The red light will be showed and the audio indicator will ring if the stone is real diamond. Simple calibration for stones of various sizes. Accurate and reliable reading. Matched with a testing platform for loose stones. Professional Diamond Selector II will indicate genuine diamond or fake Uses large / small switches for testing diamonds Emits audible sounds to easily differentiate the readings Diamond tester is battery powered for convenience Requires 1 standard 9v battery, which is not included specification: Color: Black Material:ABS Power supply: 1 * for DC 9V Battery (not include) Item size: 14*4*2cm (6.6 * 1.6 * 0.8in) Quantity:1set Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 set Diamond Selector Tool