Diamond Tester Pen High Accuracy Jewelry Tester Portable Thermal Conductivity Meter Professional Diamond Selector

--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