Duo Tester PDT

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Gemmological Refractometer

 Presidium Duo Tester PDT

The only gemological instrument in the industry that tests gemstones using both thermal and reflectivity testing.

Presidium Duo Tester (PDT) 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.

The Presidium Duo Tester comes with a probe pen that has a retractable probe tip which ensures consistent pressure against the gemstone during testing for more reliable results. With the industry’s thinnest probe tip size of 0.6mm, PDT tests gemstones as small as 0.02ct.

*Does not include the optional synthetic gemstone set.

*Does not differentiate between natural and synthetic colored gemstones.


  • Tests gemstones using dual tests of thermal and reflectivity properties to know more about the gemstone
  • Tests gemstones as small as 0.02ct
  • Consistent and reliable results every time
  • Clear and visible display for ease of reading measurements for both thermal and reflective test
  • No waiting time between tests
  • Simple and easy to use
  • Runs on batteries or with recommended Presidium AC adaptor

5 x AAA alkaline batteries (approximately 3 hours of continuous use)

AC port to be used with appropriate Presidium Power Adaptor (not included)

Optimal Operating Temperature: 18°C – 27°C (65°F – 80°F)

Storage Temperature: 10°C – 51°C (50°F – 124°F)



  • 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 15 colored gemstones
  • Digital index LED display for reading of reflectivity value of the gemstone (based on conversion from refractive index)
  • Built-in diamond and simulant test discs for reference
  • Built-in simulant reflective properties reference chart

Length: 165mm (6.50 inches)

Width: 77mm (3.03 inches)

Height:77mm (3.03 inches)

Model # PDT
Brand Presidium
Shipping Weight 0.8000kg
Shipping Width 0.140m
Shipping Height 0.150m
Shipping Length 0.200m
Shipping Cubic 0.004200000m3
Unit Of Measure ea

12 Months Manufacturers Warranty

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