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. Maintenance and Repair: 1. the instrument is very sensitive to the probe, must be particularly careful to protect, do not use should be set on the sheath. 2. When the indicator light is getting dark, it shows the battery will run out, and should be timely replaced battery. 3. the instrument is not used for a long time, please take out the battery. 4. in order to detect accurately, the proposed correction once a year. Specifications: Color: Black Power supply: 1 x DC 9V Battery (not included) Item size: 16 x 4 x 2.2cm (6.6 x 1.6 x 0.8in) Package Content: 1 x Diamond Selector II Tester 1 x Protected Leather Bag 1 x Texting Platform 1 x User Manual