The original one step dual tester. DiamondNite tests for non-diamond, synthetic Mossanite, or genuine diamond with one touch, taking only 1.5 seconds! Initial warm-up time is 8 seconds; recovery time between tests is an astonishing 1 second! Completely portable - uses one 9-volt battery (included) - no awkward cord or adapter neededli3-minute shut-off alert to save battery Simple on/off switch, no tricky adjustments Gray shock resistant housing with easy to read features Comes with complete instructions Patend pending Protect yourself with DiamondNite and get the right call every time!