Utilizes proven thermal conductivity testing method to verify the authenticity of diamonds. The result is indicated by clear, bright lights as well as distinctly audible beeps. It features a very short warm-up time and no waiting between tests. The unit will warn against metal as well as indicate low battery. Measuring only 3/4" x 1 1/8" x 6 1/4". The Diamond Mate is the smallest diamond tester on the market. 2 years mfg. Warranty.

Works on rechargeable batteries and includes an AC adaptor / charger.