1、Precise Testing: The diamond tester pen adopts advanced detection technology to accurately test the authenticity of jewelry, providing effortless and reliable verification. 2、Wide Application: Not only can it effectively test diamonds, but it is also capable of testing various precious gemstones including Moissan stones, making it an essential tool for jewelry market appraisals. 3、Easy Operation: The tester pen has a straightforward design and is easy to use. Regardless of your level of expertise, you can easily learn how to use this device, making it incredibly convenient for consumers. 4、Portable: The diamond tester is compact and lightweight, making it easy to carry anywhere, anytime. This meets your needs for on the go gemstone identification. 5、Highly Practical: Not only suitable for jewelers but also ideal for individual consumers, help you determine the authenticity of jewelry when purchasing, reduce the risk of being deceived.