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This diamond selector doesn't react on stones like fake crystals, or simulants such as cubic zirconium, when the probe touches the surface. . Features: An option to use or connect with A/C adaptor (not included) for long time indoor use Most compact design and low battery consumption Emit audible sounds to give warning buzzer if the probe touches metal surface Audible 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 best utilize JEM-II Specifications:Probe Warm-up Time: about 25secWorking Time: about 5 hours for continuous useSuggested Working Temperature: 18°C to 30°CWorking Voltage: 1 x 9V, 6F22 batteryor AC adaptor (110V-240V, DC 9V, optional & not included)Size: 168 x 31 x 21mmItem Net weight: 55gPackage Weight: 0.15kgPackage Size: 18cm x 6cm x 4cm Set includeds:1 x Diamond Tester1 x Vinyl Leather Pouch Case1 x Heavy duty Testing PlatformEnglish Instruction Manual