Power supply: DC9V battery (without battery)Diamond measuring pen: There are 2 kinds of tones, 3 kinds of color light displays, easy to distinguish true and false diamonds, convenient and easy to useMaterial: Plastic Procedure: 1. Turn on the power, the power indicator lights up, the instrument begins to warm up, and the instrument can be used in a few seconds. 2. Insert the bare drill bit to be tested into the appropriate hole in the bearing frame, table top up. Those who have been assembled don't need to put it in the compartment hole, you can hold it by hand. 3. Light up several LEDs according to the weight of the real and fake diamonds and the temperature of the measurement site. 4. Remove the probe cover, hold the instrument and touch the conductive plate of the back cover of the instrument with your right index finger. Let the probe slightly vertically touch the table surface of the measured real and fake diamonds. 5. Pay careful attention to the reflection of the instrument. If the remaining yellow LEDs are lit and there are 9-second tubes with a buzzing sound, it means the test-taker is a real diamond. On the other hand, if less than 9 lights come on and the instrument does not emit a sharp chirp, it is a fake diamond or product. Package Contents: 1 * Drill Pen Warm Tips1.The thermal conductivity meter is an electronic instrument specially designed and manufactured according to the thermal conductivity of diamonds to identify the authenticity of diamonds.2.This instrument is an electronic instrument, the operating environment is 5-35 degrees Celsius, and the relative humidity of the air is below 80%.3.The tested gemstone is clean, dry and at room temperature.4. When testing, it is generally enough to adjust to the grid or the second grid.