PRESIDIUM DUOTESTER II (PDT II)
Tester for diamonds and coloured gemstones using the principles of thermal conductivity and reflectivity

Presidium Duo Tester II (PDT II) is the only comprehensive tool on the market that combines two proven testing methods for gemstones. PDT II differentiates diamonds from its simulants based on both their thermal conductivity and reflective indexes. Coated gemstones can also be generally tested with the PDT II.

Product highlights:

• Tests gemstones using dual tests of thermal and reflectivity properties to know more about the gemstone


• Does not differentiate between natural and synthetic colored gemstones


• Assisted Thermal Calibration (ATC)


• Built-in test Glass and Calibration (CAL) test discs for reference


• Retractable thermoelectric probe tip that ensures constant pressure between probe and gemstone


• Industry’s thinnest probe tip (0.6mm) for testing gemstones as small as 0.02ct


• Metal alert buzzer to ensure that probe tip is in contact with gemstone during testing


• Large easy-to-read analog dial with 16 colored gemstones


• Large easy-to-read analog dial and a digital index LED display for reading of reflectivity value of the gemstone


• Digital index LED display for reading of reflectivity value of the gemstone (based on conversion from refractive index)


• Built-in simulant reflective properties reference chart


• No waiting time between tests


• Simple and easy to use


• Operation with batteries or with adaptor (not included)

Optional accessories:
Simulant Set for Duotester (Ref.no. 4622.201)
Single probe pen (Ref.no. 4622.210)