Features: High quality material - It is made of strong and durable ABS shell, high sensitivity alloy probe, rubber protective cover and heat conduction plate. QUICK AND ACCURATE MEASUREMENT - A quick, accurate and safe way to differentiate between simulant diamonds without damaging the diamond. Easy to use - turn on the power, wait until the heater is ready, press and hold (finger on the heat conductive plate), use the probe to make 90 degree contact with the object to be tested. Intuitive Design - Beeps and LEDs directly indicate 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. Specification: Material: plastic + electronic components Color: Black Product size: 160 x 40 x 23 mm / 6.29 x 1.57 x 0.90 inch