The Test Pen is a user-friendly tool that requires no knowledge of testing. With just a few simple steps, anyone can determine the authenticity of a . Includes a common stylus, a leather pouch, 1 pcs silver polishing cloths, 1 pcs gemstone claw, 1 pcs stainless steel tweezers. When testing, we must touch the back panel. Otherwise we get wrong results. This gemstone testing equipment is not only a tester, but also a multi-gemstone tester. It can detect the authenticity of gemstones, including: diamonds, sapphires, , crystals, onyx, emeralds and other gemstones of various sizes. Please be sure to follow the correct testing procedures and avoid using the Tester on unsuitable items (metal, skin, water, etc.) to accurate test results. Any incorrect operation may affect the accuracy of the test., Manufacturer: Akfldms