HMKIS Diamond Tester Pen, Environmental Protection 9V Battery, High Accuracy Jewelry Diamond Tester, Professional Diamond Selector for Novice and Expert, Thermal Conductivity Meter (Diamond Tester)
- [Easy to Use]: Real Diamond will Emits sounds and lights >=9..
- [Intuitive Design]: Fake crystal, such as cubic zirconium ( CZ ), crystal, glass will be no sounds and lights.
- [Supporting battery]: Supporting alkaline mercury-free environmentally friendly high-performance battery.
- [fast and safe ]: This diamond selector tester designed for quick, precise, and safe diamond testing. No harm to diamonds..
- [Note]: Please ensure that the battery temperature is higher than 10 ℃, can not test metal, save power.