Features: 1、Professional instruments can help you test the authenticity of masonry. You can not only test diamonds, but also test the authenticity of agate, jade, and crystal. Can meet your daily needs. 2、You will receive a jewelry tester set, which includes a jewelry testing kit, a small holder for easy measurement of the diamond, and a leather case. How to use: 1: Put the battery in. 2: Turn on the switch.Make sure only 1 light is lighting up on the scale. Make sure the “Ready Lamp”Light on. 3: Turn on the lights number corresponding to the indoor temperature and diamond weight. 4: When testing diamond, your index finger must keep touching the mmetal panel on the back of the gold detector for jewelry. The probe is 90 degrees vertical to the diamond. Package include: 1 x Diamond Tester Jewelry Tools 1 x Leather Pouch Case 1 x Testing Platform 1 x User Manual 1 x 9V Battery ACCURATE DETECTION: Our diamond tester features a sophisticated sensor system that accurately identifies diamonds, with 5 lights for glass, 5-6 for jade, 5 for cubic zirconia, 7 for gemstone crystal, and 9 for diamonds and moissanite. It's designed to provide clear distinctions for various gemstones, ensuring you get precise results EASY OPERATION: Insert the battery, power on the tester. Adjust the indicator to the fourth mark (Otherwise, inaccurate results may be obtained), press the triangular metal plate at the back with your finger, and position the probe perpendicular to the gemstone. For diamonds, the light will jump to the ninth segment or higher (red light area) and emit beeps. Always reset to the fourth mark before each test METAL DETECTION RESTRICTIONS: The diamond tester is not designed for metal gold type testing. When testing metals, it will emit a rapid beeping sound due to the similarity of the thermal conductivity of the metal to the diamond. It may mimic diamond readings and beep when exposed to high thermal conductivity products. Testing gemstone diamonds only PACKAGRE CONTENES: The diamond detector complete set includes a diamond tester pen, user manual, and testing platform for your convenience. Before you begin testing, please carefully read the instructions and tips in the user manual to help you achieve the most accurate results from the diamond tester PRECAYTIONS: For accurate testing, avoid testing in windy conditions. Position the tip of the diamond tester professional perpendicular to the gemstone for accurate readings, observe the light pattern to determine the stone's authenticity. Always turn off the power after testing to conserve battery life SEAMLESS SHOPPING EXPERIENCE: Our dedicated customer service is ready to assist you with any questions you may have about product usage, ensuring you can fully leverage our diamond tester