Description: High precision diamond testing: This diamond tester pen is specifically designed for accurately distinguishing real diamonds from other simulated gemstones, ensuring reliable resultsUser friendly use: The jewelry selector is easy to operate, allowing for simple, quick, and clear calibration of various gemstones without any hassleVersatile functionality: Equipped with a multifunctional design, this diamond testing pen tool is ideal for testing not only diamonds but also moissanite and other gemstonesCompact and portable design: With dimensions of 16 cmx4.9 cmx2.2 cm/6.30 inchx1.93 inchx0.87 inch, this stone testing tool is compact and lightweight, making it easy to carry around without taking up much spaceWide range of applications: Thermal conductivity meter is nice for use in purchasing, trading, auctions, or by enthusiasts 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(Batteries are not included) 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!