Features: Professional rechargeable diamonds tester pen with charging delivers rapid results, combining thermal conductivity analysis, UV light detection, and hardness testing for accurate identification of diamonds, moissanites, and gemstones. Engineered with a shock resistant plastic casing and intelligent auto shutoff, this portable gemstones tester features a pen style design with clear LED indicators for effortless operation in any environment. Trusted by jewelers, antique collectors, and gems enthusiasts seeking professional grade verification during purchases, sales, or personal collection assessments. Conduct precise windless condition testing at flea markets, jewelry stores, or home evaluations through direct skin contact measurement (10-35°C) with 9 light/sound diamonds confirmation. Achieve laboratory level accuracy in pocket format through advanced thermal/UV double verification, complete with humiditys resistant construction and scratch proof diamonds testing tip for lifelong durability. Specifications: Material: Plastic Shell Battery Capacity: 800mAh Product Size: Approx. 6.22x1.77x0.83inch(15.8x4.5x2.1cm) Box Size: Approx. 7.87x2.09x0.98inch(20x5.3x2.5cm) Package Includes: 1x Diamonds Test Pen note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.