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Portable Diamond Testing with THERMAL CONDUCTIVITY and REFLECTIVITY measuring in the same Affordable instrument!! Double the confidence in testing for diamonds against all known simulants- including Synthetic Moissanite!! Identify Diamonds & Colored Stones! The PRESIDIUM DUOTESTER is the only tool on the market that provides the user with two proven tests for diamonds and the ability to differentiate between similarly colored gemstones. The easy-to-read dial of the DUOTESTER is calibrated to indicate the differences in thermal conductivity of the most popular gemstones and simulants. Simply touch the tip of the thermal conductivity probe pen to a mounted or loose stone. Diamond is easily identified by any reading in the green area of the dial- and colored gemstones can be easily differentiated from one another by the clearly labeled zones provided in the red area. Runs on 5-AA batteries; AC Adaptor (included)