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A-Source Moissanite and Diamond Tester is reliable and easy to use tester. This tester detects diamonds, moissanite and diamond simulants using the principles of both Thermal and Electrical Conductivity. The 4 color coded windows display the result from a touch of the stone with the tip of the tester. Results are displayed at the top of unit, unobstructed by user's hand and can be seen from any position. Features: Highly sensitive and heavy duty tip design Color LED display (Green, Yellow & Red) Pocket Size, Factory calibrated, no adjustment necessary, Auto power shut down, Visual and audio indication of Diamond. Powered by 3x AAA batteries AC adapter is optional Soft case included Easily audible beeping sounds also indicate results. 2 Year Warranty.