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* PGCG also comes with a CD-Rom that lists the S.G. value, R.I. value, and hardness measurements of 133 common gemstones in the market for handy reference.* Features :- Measures from 0.0 to 25.0mm.- Accuracy: 0.01mm / Tolerance: 0.02mm.- Digital mm/ct display.- Automatically shut off when idle for 10 minutes.- Auto-magnetic shut-off when placed in carrying case.- Computer interface display with CD and USB (Universal Serial Bus) connectivity.- Attachment for high setting jewellery provided.- Specific Gravity (S.G.) dictionary for quick and easy reference included.- CD-ROM containing information on 133 gemstones (e.g., S.G. value, R.I. value and hardness) included.- Benefits Measures actual gemstone dimensions and estimates gemstone weight and identity.- Measures 74 gemstones and 9 different shapes.- Accurate measurement to 0.01mm.- Direct carat conversion for round brilliant-cut diamonds.- Clear and visible display for ease of reading measurements.- Light and portable instrument that can be used anywhere.- PC connectivity for ease of importing and printing measurement results.- Power and Battery 1 x CR-2450 3V battery (about 80 hours of continuous use).- Measurement Range 0.00mm to 25.00mm or 0.000ct to 57.343ct* (based on round brilliant cut).* Package contents – Presidium Gemstone Computer Gauge.- CR-2450 3V battery.- High setting jewellery attachment.- Mini CD ROM.- USB Cable.- User handbook.- Warranty card.- Protective box.* Dimensions and Weight :- Length: 97mm.- Width: 61mm.- Height: 16mm.- Weight: 120g (without battery).