High -precision test: Use advanced electronic technology to quickly and accurately identify diamonds, Mosset and other gems. By accurately distinguished diamonds, synthetic diamonds, and other gems to the purchase of real jewelry. Easy to use: Diamond test pen operation is simple. Just touch the pen tip to the of the jewelry gently, it provide the test results in a few seconds. Green light means a real diamond, and Hongguang means the possibility of artificial diamonds or other gems. Suitable for a variety of scenarios: In addition to testing diamonds, Diamond Tester Pen can also detect Moisanite and other gems. It provides test modes and functions to meet your testing needs for different types of jewelry. Note: The battery and power cord cannot be used at the same time. The battery cannot be installed when using the power cord. The battery needs to configure the 9V battery by themselves. There are no batteries when we ship, only power cords. Easy to carry: The diamond test pen is portable, allowing you to carry and use it easily. Its compact size and structure allows you to conduct diamond tests anytime, anywhere, whether in jewelry shops, second -hand markets or travel. Feature: Diamond and Moissanite Tester, LED Diamond Detector, High Measurement Accuracy, Compact, Easy To Carry, for Non-Diamond, Synthetic Moissanite or Diamond Testing Introducing our Diamond Tester - a versatile drill pen that helps you distinguish between real and fake diamonds with high measurement accuracy. It is capable of measuring diamonds and moissanite, making it a for identifying gemstones. Please note that it does not measure metal series. Our Diamond Tester is designed to be and compact, allowing for easy portability. It can be powered by both a 9V DC battery andan external AC power supply, providing you with two convenient power supply options. Specification: Measuring range: diamond, moissanite Working power supply: