Features: Easy operation. LED light and audio result indication. The red light will be shown and the audio indicator will ring if the stone is a real diamond. Simple calibration for stones of various sizes. Accurate and reliable reading. Matched with a testing platform for loose stones. Light weight, matched with a convenient carrying case. A detailed user manual is included in the package. Maintenance and repair: 1, the instrument is very sensitive to the probe, must be particularly careful to protect it, do not use should be set on the sheath. 2, the preparation of the indicator light is very dark, showing the battery will run out, should be a timely replacement battery. 3, If the instrument is not used for a long time, please take out the battery. 4, To detect accurately, the proposed correction is once a year. Specifications: Color: Black Material: ABS Power supply: 1 * DC 9V Battery (not include) Item size: 14*4*2cm (6.6 * 1.6 * 0.8in) How To Use: 1. Open the power, the power indicator light, and the instrument begins preheating, after a few seconds instrument can be used. 2. Take the naked drill to be tested into the support tray appropriate sunken hole, and its mesa upwards. Those already inlay need not put a tray hole in, you can use your hand to hold it. 3. According to the weight of the tested diamonds and measuring the temperature place to move several bright LEDs. 4. Take down the needle sheath, and handhold instruments, the right index finger touches the conductive plate on the back cover of the instrument. To make the probe vertically and gently contact with the mesa of a measured diamond. 5. Carefully watching the instrument, if the rest of the emitting diode light reflects yellow when the light place moves to nine diodes with accompanying beeping, this explains those tested are for real diamonds. On the contrary, if the light place moves to insufficient nine diodes, and without accompanying beeping, this explains the fake diamond. 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.