High-precision diamond testing device for professional jewelers (black diamond testing device)

Features: [FastSafe] The Diamond Selection II professional diamond tester identifies genuine and fake diamonds. It is designed for quick, accurate and safe diamond testing. [Intuitive Operation]: LCD screen and LED display. Tests diamonds with a large/small diamond switch that beeps for easy differentiation of readings. [Easy to Use]: Diamond testing is simple and provides results without professional assistance. Simply turn on the diamond tester; place the tip of the tester on the gemstone (light pressure is sufficient). If the tester does not beep, it is a fake, crystal or cubic zirconia. [Package Contents]: The diamond tester is battery-operated and requires a standard 9V battery.