Features: 1.EASY TO IDENTIFY THE AUTHENTICITY: Diamond jewelry tester has 2 sounds and 3 colors of light, easy to identify the authenticity of diamonds. 2.NON DESTRUCTIVE TESTING: Diamond selector is non destructive, easy to operate and accurate. Portable diamond jewelry handheld tester. 3.QUICK DISTINCTION: Diamond tester tool is used to quickly distinguish natural diamonds and various imitation diamonds without harming the diamonds. 4.PRINCIPLE OF OPERATION: Diamond tester is designed according to the different thermal conductivity of diamonds and various imitation diamonds. 5.EASY TO CARRY: Professional diamond selector is easy to operate, no need to be a professional to get the result, easy to carry. specification:Item Type: Diamond Tester Material: ABS Applicable To: Diamond Identification Battery s: 2 x AAA Batteries (Not Included) PackageList:1 x Diamond Tester 1 x Instruction Book 1 x Storage Bag 1 x Test Platform NoteRepair and maintenance: 1. The instrument probe is very sensitive and must be protected with special care. Please wear a protective cover when not in use. 2. When the indicator is very dark, it means the battery will be exhausted, and the battery should be replaced in time. 3. If the instrument is not used for a long time, please remove the battery.