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This tester is designed to distinguish diamond, moissanite from other fake stones quickly. It has fine elastic tipped probe for testing and able to identify stones as small as 2pt. Features:Easy operation without necessary to adjust LED bar graph via volume control to match stones of different sizes like that used in other diamond tester modelsCould be powered by AAA batteries, NiMH batteries or an AC power adaptor (not included in the set)Can distinguish stoned as small as 2 ptLow battery detectorEquipped with an elastic probe tipBuilt-in metal detectorWith "beep" sound indicatorRubber paint finishFactory CalibratedSpecifications:Working Voltage: DC 4.5V, AAA batteries or NI-MH battery or AC adaptor (110~240V, DC 4.2V) (not included in the set)Probe warm-up time: about 25 secondsWorking time: about 2 hours of continuous useNet weight: 65g (not including batteries)Tester Size: 173 x 42 x 22mm (L x W x D)Working Temperature: 18 ~ 30°C Set Includes:1 x Diamond Tester1 x Testing BaseEnglish User ManualCarrying CaseStandard Factory Package