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* Does not differentiate between natural and synthetic colored gemstones.* Features : – Retractable thermoelectric probe tip that ensures constant pressure between probe and gemstone. – Industryâs 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. – Colored gemstone display. – Large easy-to-read analog dial and digital index LED displays. – Built-in diamond and simulant test discs for reference. – Built-in simulant refractivity chart. – Built-in simulant set for calibration of reflectivity meter (optional item provided by Presidium). – Powered by 5 x AA batteries or AC adaptor. – Leather carrying case included. – Benefits Tests gemstones using both thermal and reflectivity testing. – Tests gemstones as small as 0.02ct. – Consistent and reliable results every time. – Clear and visible display for ease of reading measurements. – Simple and easy to use. – Light and portable tester that can be used anywhere. – Power and Battery 5 x AA batteries (approximately 4 hours of continuous use). – AC adaptor 120 / 230 volts (standard item provided by Presidium). – Measurement Range 0.02 carat and above. – Operating Conditions Operating temperature: 18Â°C-27Â°C (65Â°F-80Â°F). – Storage temperature: 10Â°C- 50Â°C (50Â°F-122Â°F).* Package Contents – Presidium Duo Tester. – Probe pen. – AC adaptor. – Colored gemstone display. – Built-in simulant reflectivity chart. – Built-in test simulant discs. – User handbook. – Warranty card. – Leather carrying case.