The PRESIDIUM® Diamondmate electronic diamond tester, detects authencity of diamonds. It utilizes proven thermal conductivity testing method to instantly verifies and detects authenticity of diamonds. Test results are indicated by visual light and audible beeps. No waiting time between tests. It is a pocket size, electronic diamond authenticator tool, a diamond testing device, has a low batteries indicator. Metal detector - intermittent beep. - Measured diamond - continuous beep. - Low battery consumption.