Presidium® DUO Tester (PDT)

Uses two proven testing methods for gemstones (coated gemstones) by differentiating diamonds from its 

simulants based on thermal conductivity and reflective indexes. Built-in simulant set for enhanced calibration 

of the thermal tester. Retractable probe for consistent pressure against the stone. Test diamonds as small 

as 0.02 ct. Powered by AC adapter(included) or by 5 AA batteries (not included). One-year factory warranty.
Stones not included.