Description: 【Portable and Easy to Use】: This diamond tester pen is designed for convenience with its compact, handheld size, making it easy to carry and operate, allowing for quick and accurate testing without causing any damage 【Reliable Diamond Testing】: Equipped with advanced technology, this jewelry selector accurately distinguishes real from fake by using thermal conductivity principles. Simple to operate and provides quick and accurate differentiation between real diamond and other simulated gemstones 【Quality Material】: Constructed from quality ABS material, this diamond tester ensures durability and longevity. Its sturdy design withstands regular use while maintaining accuracy in testing 【Compact and Portable design】: With dimensions of 16cmx4.9cmx2.2cm/6.30inchx1.93inchx0.87inch, this Diamond Tester Pen is compact and lightweight, making it easy to carry without taking up much space 【Wide application】: This Stone hardness tester is ideal for use in purchasing, trading, auctions, or by hobbyists to verify the authenticity of gemstones in various scenarios. This diamond testing pen tool is nice for testing diamond, Moissanite, and other gemstones, making it an essential addition to any gem enthusiast's toolkit Specification: Material: ABS Power supply: 9V battery (not included)/US Plug US Plug Voltages: 110~120V Size Chart: 16cmx4.9cmx2.2cm/6.30inchx1.93inchx0.87inch Package Includes: 1Pc Diamond Tester Pen 1 US Plug 1 Instruction Manual 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.