Digital Craft The diamond selector ii is a professional and portable diamond tester built to quickly distinguish diamond from cz common stimulants such as white corundum, yag, and american diamond. The diamond selector ii will test stones large and small, mounted or uncounted, with ease and reliability. This is the most affordable diamond tester on the market today. This tester is perfect for the working jewelry professional, jewelry lover, and flea market attendees; it is simplistic but accurate testing to ensure that you do not make a bad purchase. One error could cost more than this tester. Never second-guess again! Operating on 1 long-lasting 9-volt battery (included), this tester will automatically alert you for low battery. FEATURES: Easy to use Led light and audio result indication. The red light will be shown and the audio indicator will emit beeping sound if the stone is a real diamond. Metal alert for continuous buzzing sound when user accidentally touches metal rather than stone. If the stone is, diamond simulated one, no beeping sound or red lights on. Simple calibration for stones of various sizes. With a testing platform for loose stones. Lightweight and easy to carry. Instantly distinguishes diamond from cz and common stimulants (excluding moissanite) Distinctive audio and visual signals Low battery warning Completely portable Fast warm-up time and immediate recovery Powered by 1pc 9-volt battery (included) SPECIFICATIONS: If the number of lights equal or exceed 9, and it beeps, it means the diamond is true. If the number of lights is 9 and it beeps, it means the sapphire is true. If the number of lights is 6.5-7, it means the agate is true. If the number of lights 7-8 , it means the crystal is true. If the number of lights is 6-7, it means the jade is true. Probe warm-up time: about 25sec Working time: about 5 hours for continuous use Suggested working temperature: 18°c to 30°c Working voltage: 1 x 9v, 6f22 battery (included) Size: 17x3x2 cm Net weight: 55g BEFORE TEST: 1. Put the battery into the tester. 2. Take off the probe cap. 3. Turn on the switch. 4. Make sure just 1 light light up on the scale. 5. Make sure the " ready lamp" light on. 6. (If you test diamond, you then need to turn on the number of lights corresponding to the indoor temperature and diamond weight. ) 7. (If you test other gems, you'd better calibrate the probe before testing, Method: by placing the probe vertically on a piece of glass, then adjusting the light to 5, and then placing the probe on the gemstone to test.) 8. Test is ready. NOTICE: No matter what gemstone you are testing, the probe needle and the tested object must be at a 90° angle. When testing diamond, your right index finger must keep touching the metal panel on the back of the tester, while you do not touch the panel if you test other gemstones. Do Not test any metal. Do not wear glove. PACKAGE: 1 X Selector + 1 X Battery + 1 X Manual + 1 X Stone Rest + 1 X Case + 1 x Catcher Tool