Product Description Features: 【Intuitive Design】Diamond Tester comes with LED lights and audio indication. During a test, if the stone tested is a diamond, the LED lights will light up as the stone passes each test conducted by the Diamond detector. Once our Diamond Tester has completed all of its tests, the pen will make a beep sound as well as show a row of fully lite LED lights.【Fast Results】Diamond Tester Pen is design to deliver fast, accurate results. You will be able to know if something is fake in a matter of seconds.【Simple to Use】Diamond Tester Pen is simple to operate to get results, professional(s) are not required. Simply turn on our Diamond Tester Pen detector; place the tip of the Diamond Tester on the gem stone (lightly pressed is sufficient) and If the stone is fake, crystal or cubic zirconia, the tester will not beep. 【Application Range】Industrial Purpose, Circuit Board And Printing , Industry, Medicine, Gardening, Coin, Diamond,Stamp, Jewelry, Appraisal, Education, Geography, Home And Office. Specifications: Color: GreyDimensions: 160*42*22mmTesting Capability: Diamonds, Diamond simulation (e.g. CZ), MetalAuto Off: " N/AInitial warm-up: ~ 20 sec.Indicator: Audio and LED lampsPower: 1 x 9V Battery ( not included) Package Included: 1 x Diamond tester(battery not included)1 x Testing platform1 x Carrying case1x User's manual