Feature: 1. Initialization: After powering on, turn the wheel to keep 4 green lights on to finish the Initialization. Otherwise you will get inaccurate results. Diamond tester pen is design to deliver fast, accurate results. 2. 2 Hands Operation: All test must be done by 2 hands, one for hold the diamond and one for the diamond tester. As for the hand which hold diamond tester, you have to touch the electricity conductive panel on the back of the unit.If you test the diamond just by one hand, you will get a wrong result. 3. Simple to Use: For testing diamond, it will emits beeping, beeping, beeping in a low frequency, 1 time/second. Meanwhile 1‑4 pieces of the red lamp box of the level meter light on(the bigger the size of the stone is, the more pieces of the red lamp box of the level meter light up). When testing imitation stone, such as cubic zirconium ( CZ ), crystal, glass, there will be no sound, and the red lamp won't light. 4. Metal Alert: When testing metal, it will emits beeping, beeping, beeping, 5times/second. The thermal conductivity of the metal is very high and can give the same indication as a diamond with most thermal probes. This diamond selector has a metal alert buzzer to warn you when touches metal. If you hear the metal alert buzzing sound, retouch the probe tip so as to touch only the tested stone. 5. Application: 60X led Magnification with batteries (small microscope). For precious stone, coins, antiques, stamps, reading, inspection etc. Professional diamond selector will indicate genuine diamond or fake. It is designed for quick, and safe diamond testing. Specification: Item Type: Diamond Tester Pen Material: Plastic Weight: Approx. 196.00g / 6.91oz Diamond Tester Pen Battery Type: 1 x 6F22 9V (Not Included) Magnifier Battery Type: Built in Button Cell Battery (shipped with) Battery Model: 3 x LR1130 Battery Capacity: 240mAh Diamond Tester Size: Approx. 160x41x22mm / 6.3x1.6x0.9in Magnifier Size: Approx. 4x3.7x2.1cm / 1.6x1.5x0.8in . Package List: 1 x Diamond Tester Pen 1 x Tweezers 1 x Magnifying Glass 1 x Diamond Stand 2 x Protective Bag 2 x English Instruction Manual