Features: Our professional grades diamond tester helps you accurately identify the authenticitys sand quality of diamond, providing reliable results every time. With multiple functions including fluorescence testing, color identification, and claritys detection, our diamond tester offer a comprehensive analysis and evaluation ofdiamond. Whether you're a gemstoneenthusiast, a jewelry retailer, or a professional gemologist, our diamond tester is designed for all individuals and businesses involved in diamond appraisals and evaluation. Diamond tester is easy to use, with LED lights and audios instructions. Just place the tip of the diamond tester gently on the gemstones. If the gemstonetested is a diamond, the pen will beeps and display a row of fully LED lights. If thegem is fake, crystal or cubicszirconia, the tester will not beeps. They can be easily put in your wallets or backpack without taking up a lots ofspace. They are a must have kits when you are going to a garage sale, fleamarket, swaps meet, etc. Specifications: Material:ABS, Electronic Component Size:Approx.17x5x3cm/6.69x1.96x1.18inch Color:Black Package Includes: 1x LED Diamond Tester note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.