Diamond tester, professional, high-precision diamond test pen for jewelry, portable gold testing kit

User-friendly operation: The simple one-button operation with clear LED and audible signals makes it incredibly easy to use for both beginners and professionals. Battery compatibility: The tester is powered by standard batteries (not included) and is always ready for use thanks to the required cables or rechargeable battery. High-precision testing: Thanks to precise thermal conductivity technology, the tester quickly identifies genuine diamonds and is perfect for testing loose stones or for setting jewelry. Versatile testing device: Ideal for diamonds, it also provides general information for verifying the authenticity of other stones. An indispensable tool for jewelry makers, collectors, and dealers. Compact and portable: The lightweight and handy tester is ideal for on-the-go use and ensures the authenticity testing of gemstones anytime, anywhere.