High-quality material - It is made of strong and durable ABS shell, high-sensitivity alloy probe, rubber protective cover and heat conduction plate. FAST AND ACCURATE MEASUREMENT - A fast, accurate and safe way to differentiate simulant diamonds without damaging the diamond. Easy to use - turn on the power, wait for the heater to be ready, press and hold (finger on the heat conduction plate), use the probe to make 90-degree contact with the object to be tested. Intuitive design - Beeps and LEDs directly indicate the test results (Acousto-Light: Diamond, Continuous Buzz: Metal, No Sign: ), Simulator. Portable leather bag - Small and lightweight diamond tester, powered by 1 x 9V 006P battery, comes with a leather case for easy storage and portability. The product does not come with batteries.