Presidium Duo Tester - Performing Optical Test

The only gemological instrument in the industry that tests gemstones using both thermal and reflectivity testing. Presidium DuoTester is the only comprehensive tool on the market that combines two proven testing methods for gemstones. PDT differentiates diamonds from its simulants based on both their thermal conductivity and reflective indexes. Coated gemstones can also be generally tested with the PDT.