[Upgrade] High-precision diamond tester for professional jewelers, suitable for beginners and experts – Diamond Selector II, 9V battery included (Black Diamond testers) (battery not included).

[Fast and Safe]: The Professional Diamond Selector II will indicate whether a diamond is genuine or fake. It is designed for fast, accurate, and safe diamond testing. [Intuitive Design]: LCD screen and LED indicator. Uses large/small switches to test diamonds and emits audible sounds to easily differentiate readings. [Easy to Use]: The Hqdz Diamond Tester Pen is simple to use for obtaining results; professional expertise is not required. Simply turn on our Diamond Tester Pen; place the tip of the diamond tester on the gemstone (light pressure is sufficient), and if the stone is fake, crystal, or cubic zirconia, the tester will not beep. [Package Includes]: The diamond tester is battery-powered for convenience. Requires one standard 9V battery, which is included.