Portable Diamond Tester Pen Thermal Conductivity Meter For Detecting Identifying Diamonds Emerald Crystals Diamond Tester Pen

• --This instrument is a precision electronic instrument, the operating environment is 5-35 degrees Celsius, and the relative air humidity is below 80%.
• --Products to be tested must be clean, dry and at room temperature.
• --LED lights and audio result indication. Lightweight and comes with a convenient leather case.
• --Safe and reliable: It is professionally manufactured, with strict quality control, long life

Description:
Name: Diamond Tester Pen

Use environment: 5-35°C
Air relative humidity: less than 80%
Power supply: 1 x DC 9V battery (not included)

Packing list:
1 set x Diamond Tester Pen
Note:
Different displays may cause the color of the item in the picture a little different from the real thing. 
Manual measuring,please allow 1~3mm error,thank you.