The industry’s most trusted colored gemstone tester is now redesigned to be more compact, sturdy and portable. In its second generation, the Presidium Gem Tester II provides a quick and easy way to identify diamonds/moissanites and separates up to 16 common colored gemstones based on their thermal conductivity with its clear and direct analog display. A newly redesigned inbuilt calibration reference and adjustment provides ease of operation both indoors and outdoors. The Presidium Gem Tester II features the industry’s thinnest retractable probe tip (0.6mm) for testing colored gemstones as small as 0.02 carats. Coated gemstones can also be generally tested with PGT II. *Does not differentiate between natural and synthetic colored gemstones. Features 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 0.02 carats Metal alert buzzer to ensure probe tip is in contact with gemstone during testing Clear and easy-to-read analog dial Can differentiate between 16 types of gemstones Built-in Glass and Calibration (CAL) test discs for reference Benefits Identifies diamonds/moissanites and most common colored gemstones Tests both polished and unpolished gemstones Tests gemstones as small as 0.02 carats Consistent and reliable results every time No waiting time between tests Simple and easy to use Runs on 2 AA batteries or adaptor (included) Specifications Power & Battery 2 x AA alkaline batteries (approximately 3 hours of continuous use) AC port to be used with appropriate Presidium Power Adaptor (included) Recommended Operating Conditions Optimal Operating Temperature: 18°C – 27°C (65°F – 80°F) Storage Temperature: 10°C – 51°C (50°F – 124°F) Dimensions & Weight Length: 125mm (4.93 inches) Width: 90mm (3.55 inches) Height: 70mm (2.76 inches) Weight (without batteries): 220grams (7.76 oz) This item includes:30 Day Money Back GuaranteeFree Shipping (USA lower 48 states)Free Return Shipping (USA lower 48 states) Sold By FindingKing. PROP. 65 WARNING: This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm.