The Presidium Moissanite Tester II (PMT II) measures the electrical conductivity of the gemstones directly, determining if the gemstone is a genuine diamond or a moissanite (a diamond simulant).
Presidium recommends the use of the Presidium Moissanite Tester II after a positive test result for diamond is indicated on a thermal conductivity diamond tester (such as the Presidium Diamond Mate Tester).