Thermal Conductivity Meter Diamond Test Pen Crystal Hardness Identification Instrument(No Battery)

The Thermal Conductivity Meter Diamond Test Pen is an electronic instrument used to identify the authenticity and hardness of diamonds and gemstones. It operates without a battery and is designed for everyday use.

• Material: Plastic + alloy probe
• Working power supply: 9V battery x 1 (not included)
• Identifies authenticity and hardness of diamonds and gemstones
• Metal tip of the probe is electrically heated
• Buzzing sound indicates contact with diamond surface
• Probe must be at a 90-degree angle to the object being tested
• Three-color indicator light adjusts to 4th grid for testing
• Red light area indicates diamond authenticity
• Operating environment: 5-35 degrees Celsius
• Dimensions: 41x155x21 mm
• Net weight: 57 grams