LED light and audio indication of results. Red light is displayed and the audio indicator sounds if the stone is a genuine diamond. Easy calibration for stones of different sizes. Accurate and reliable reading. Lightweight, matched with a practical carrying case. Detailed user manual included in the package. The thermal conductivity is designed and manufactured according to the thermal conductivity of the diamond. It is specially used to identify genuine and fake diamonds. Tips: Gemstones should be clean, dry, and at room temperature. During the test, transfer to the first or second grid. V2 Gold Test Kit with Gemstone Pen, Handheld Electronic Diamond Tester with LED for diamonds, sapphires, rubies, crystal, agate, jade, gemstones, hardness testing tool. Features: Easy to use. LED light and audio indication of results. Red light is displayed and the audio indicator sounds if the stone is a genuine diamond. Easy calibration for stones of different sizes. Precise and reliable reading. Corresponds to a test platform for loose stones. Lightweight, matched with a practical carrying case. A detailed user manual is included in the package. Features: Color: black. Power supply: 1 DC 9 V battery (not included). Dimensions: 16 x 4 x 2.2 cm. Maintenance and repair: 1. The instrument is very sensitive to the probe, special care should be taken to protect it, when not in use it should be placed in the casing. 2. The preparation of the indicator light is very dim, indicating that the battery will be discharged, it should be replaced in time. 3. If the instrument is not used for a long time, remove the battery. 4, to detect correctly, correction is suggested once a year. Tips: 1. The thermal conductivity is designed and manufactured according to the thermal conductivity of the diamond. It is specially used to identify genuine and fake diamonds. 2. Precision electronic instruments, the use of the environment for 5-35 degrees Celsius, the relative humidity at 80%. 3. Stones must be clean, dry, and at room temperature. 4. When testing, transfer to the first or second grid. Contents: 1 Diamond Selector II.