Just turn on our diamond tester pen; place the tip of diamond tester pen on the gemstone and it gently. Provides results quickly and accurately. diamond tester pen no need to worry about missing the details of the gemstone Diamond tester pen adopts a clear screen design, diamond tester pen you can quickly get useful data; when the data is above 9, the item you tested be a real diamond. Diamond tester pen is a friendly tool that does not require professional diamond detection knowledge. diamond tester pen with just a few simple steps, anyone can judge the authenticity of a diamond. Diamond tester pen is your must-have tool. Its compact design and powerful LED light convenient to use in various environments, diamond tester pen providing clear and detailed magnification so that you can see the items you want to know. For the best accuracy, diamonds should be tested with bare hands. Wearing gloves interfere with the metal alarm function of the diamond tester pen. diamond tester pen is small and portable, convenient to hold or store. Color: As Shown Material: Metal Package Contents: 1*set diamond tester pen Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.