Diamond Tester is a portable device used to test material for its thermal and electrical conductivity. It can indicate if the stone is a real diamond based on its physical properties. Meaning, heat  will pass through a diamond in a different way than it would through white sapphire, for example. To test if a diamond is real, you need to place the tip of the tester on the stone and detect the rate at which heat moves through the stone. If the diamond is genuine, the device indicates that on the display and gives a special sound signal.
Notes:
1. The tester is an electronic instrument designed and manufactured according to the thermal conductivity of diamonds to identify the true and false diamonds. It can also be used for testing sapphire, ruby, crystal, agate and other stones.
2. This tester is a precision electronic instrument, the use environment is 5-35℃, and the air relative humidity is 80%.
3. The tested gemstone must be clean, dry and at room temperature.

Steps for Testing:
1. Install the battery and take off the probe tip cap.
2. Turn on the switch and make sure the Battery Lamp lights up.
3. About 30 seconds later, Ready Lamp will light up.
4. Select a number in calibration chart(we suggest 4 for calibration number) according to temperature and the size of tested stone.
5. Find the selected calibration number under light bar, and turn the switch toward the direction of ON to let the light bar reach to the place the selected number lies
6. Start to test diamond or other stones, your hand needs to hold silver triangle conductive plate when testing and the probe tip needs to perpendicular to the tested stone.

Test Results:
  • If the number of lights equals or exceeds 9, and it beeps, it means the diamond is true.
  • If the lights is about 9 and it beeps, it means the sapphire is true.
  • If the number is 6.5-7, it means the agate is true.
  • If the number is 7-8 , it means the crystal is true.
  • If the number is 6-7, it means the jade is true.