Brand Name:eshowModel Number:Y1012AUsage:Jewelry TesterDescription:1: 100% Brand new.2: LCD display and LED indicator.3: Easy to use even for a new beginner.4: Emit audible sounds to give accurate reading.5: Diamond indicator will be showed if the stone is a REAL diamond.6: Metal alert (continuous buzzing sound when user accidentally touches metal rather than stone)7: Large/small switch for testing diamonds +/- 8 points.8: To emit sound to give accurate reading.9: If stone is Fake crystal, a stimulant such as cubic zirconium (CZ), will be no reaction.10: Dimension: 15.5*4.0*2.2cm11: Net weight: 66g12: Power supply: DC 006P 9V battery. Package Include:1 x Diamond Selector II1 x English Manual1 x 9V Battery1 x Carrying Case