HMKIS Diamond Test Pen, High Precision Jewelry Diamond Tester + 60X Mini LED Magnification, Professional Diamond Selector for Novices and Experts, Thermal Conductivity Meter
【Easy to Use】Real diamonds make sounds and lights >=9.
[Intuitive Design]: Fake crystals, such as cubic zirconia (CZ), crystal, glass will not emit sound and light<9.
【FAST & SAFE】: This diamond selector tester is designed for fast, precise and safe diamond testing. Harmless to diamonds.
[Magnification]: 60 times LED magnification (with battery) (small microscope). Can be used for gems, coins, antiques, stamps, readings, inspections and more.
[Note]: Please ensure that the battery temperature is higher than 10 ℃, metal cannot be tested, and power saving.