915 Generation Thermal Conductivity Meter Drill Pen Hardness Discriminator

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.
This instrument is a precision electronic instrument, the operating environment is 5-35 degrees Celsius, and the relative humidity of the air is 80%.
The gemstone to be tested must be clean, dry and at room temperature.
When the probe is heated by electric heating, it can detect surfaces such as diamonds, and the electric heating sensor will beep when the temperature Colour: black
Material: plastic Package Contents:
1 x drill pen
Note: without 9V battery Only the above package content, other are not included.
Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.