Equipped with ultraviolet light to test flourescent reaction of stonesFlexible calibration with multi Level Volume to match different sizes of stonesAn option to use or connect with A/C adaptor (not included) for long time indoor useMost compact design and low battery consumptionEmit audible sounds to give warning buzzer if the probe touches metal surfaceAudible and visual indicator of genuine diamondWith a single press of a button it can accurately and precisely:Supplied with vinyl pouch, testing platform for loose stones and a comprehensive instruction manual utilize JEM-IIQuickly distinguishes authentic diamond from all models of diamond simulants and metalsDistinguish stones as small as 2pt and unusedComplete set includes:1 x Diamond Tester1 x Vinyl Leather Pouch Case1 x Heavy duty Testing PlatformEnglish Instruction ManualProbe Warm-up Time: about 25secWorking Time: about 5 hours for continuous useSuggested Working Temperature: 18C to 30CWorking Voltage: 1 x 9V, 6F22 batteryor AC adaptor (110V-240V, DC 9V,not included)Size: 168 x 31 x 21mmNet weight: 55g