Description: 【High precision testing】: This diamond tester pen is specifically designed for accurately distinguishing real diamonds from other simulated gemstones, ensuring reliable results every time 【User friendly use】: The jewelry selector offers simple and quick calibration, allowing users to easily and accurately test various gemstones without any hassle 【Versatile functionality】: Equipped with a multifunctional design, this tool is nice for testing not only diamonds but also moissanite and other gemstones, making it an essential tool for gem enthusiasts 【Compact and portable design】: With dimensions of 16 cmx4.9 cmx2.2 cm/6.30 inchx1.93 inchx0.87 inch, this thermal conductivity meter is compact and lightweight, making it easy to carry around without taking up much space 【Wide range of applications】: Ideal for use in purchasing, trading, auctions, or by hobbyists to verify the authenticity of gemstones in various scenarios Specification: Material: ABS   Size Chart: 16cmx4.9cmx2.2cm/6.30inchx1.93inchx0.87inch Package Includes: 1pcs Diamond Tester Pen Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!