A-SOURCE DIAMOND/MOISSANITE TESTER utilizes the combine principles of Thermal and Electrical Conductivity from their patented technology. The measuring probes together with the electronics circuitries are designed to pick up and segregate data collected from the stones via a customized micro-controller. Within a split of a second, the test result will be displayed. Operates on alkaline (AAA) batteries or direct AC current. Batteries and AC adapter optional. FEATURES: Surface Mount Technology. No waiting time between tests. Clear LED display for Diamond, Moissanite and Simulants. Low batteries and ready indicators. Automatic power down. 2-year manufacturer warranty. Soft case included.