1、This is a test tool suitable for jewelry display or identification assistance. 2、The thermal conductivity meter is based on the thermal conductivity performance of the diamond specially designed and manufactured for the identification of an electronic instrument of real diamonds. 3、Diamond tester tool is a professional identification tool of the authenticity of diamonds and their imitation. 4、The hardness of jadeite can be detected. The thermal conductivity instrument tests measured objects when 7 lights on, indicating that the hardness of the measured objects is about 7 5、Can help you to distinguish whether your diamond is real or fake. Features:  1. This is a test tool suitable for jewelry display or identification assistance. 2. The thermal conductivity meter is based on the thermal conductivity performance of the diamond specially designed and manufactured for the identification of an electronic instrument of real diamonds. 3. Diamond tester tool is a professional identification tool of the authenticity of diamonds and their imitation. 4. The hardness of jadeite can be detected. The thermal conductivity instrument tests measured objects when 7 lights on  , indicating that the hardness of the measured objects is about 7 5. Can help you to distinguish whether your diamond is real or fake. Specification:  Item Type: Diamond Tester Tool Diamond Tester Pen Battery: 6F22 9V Battery (Not Include) Package List:  1 x Diamond Tester Tool 1 x Accessory 1 x Instruction Note: The hand should touch the metal plate behind the instrument when testing