Plug-in/battery dual use, making it more convenient to use for a long time indoors Product name: Two-in-one drill pen Product Type: Identification Test Chip specifications: high-precision chip Body material: engineering plastic Power supply specification 9V battery Product weight: about 70.5 grams (without batteries) Product features: compact, compact, precise and portable The identification principle heats the chip by the probe Detectable product instructions The first step: Install the battery or connect the gift power cord (Note: Both cannot be used at the same time) Step 2: Wait for the ready light to light up and start the test Step 3: The probe of the thermal conductivity meter is vertically in contact with the gemstone to be tested, and pay attention to touching the metal conductive plate on the back of the lead-in meter Step 4: After the test is completed, the diamond light is on to represent the tested object, the diamond light is Moissanite if the light is on, it is Moissanite