Product Feature This diamond tester has a highly compact design, which can perform fast, accurate, and safe diamond testing, which is very suitable for carrying with you when buying diamonds. This diamond tester will indicate whether your diamond is genuine or fake. You can quickly and easily understand the diamond data. The LED light and audio indication of this diamond tester test the true and false results of the diamond. This diamond tester is a precision electronic instrument, the use environment is 5-35 degrees Celsius, and the relative humidity of the air is 80%. The gems to be tested must be clean, dry, and at room temperature. This tester is non-destructive and easy to operate. Note 1. Turn on the power of the tester and heat the probe. It usually takes 20 seconds to touch the hot needle to the surface of the sample. 2. According to the signal sent by the thermal conductivity meter, it can be determined whether the sample is diamond. Product Specification Type Diamond Tester Material Plastic + Metal Color Black Size Approx. 160x40x22mm / 6.3×1.6×0.9inch Power Supply Powered by 9V battery (not included) Package Included 1 X Diamond Tester 1 X Bag 1 X Test Tray 1 X User Manual