1. Very compact design: Experience mobility without compromise. This diamond tester sits comfortably in the hand and can be easily taken to jewellery shops, pawnshops or trade fairs. Thanks to its compact design, it is always at hand when you need to authenticate diamonds, gemstones or moissanite. 2. Accurate diamond authentication: Effortlessly distinguish between real and fake diamonds with the precision of this gemstone tester. Recognize authentic diamonds and gems through reliable LED light and audio indicators to ensure you are never misled. 3. Practical PU Case and Test Platform: Protect and transport your diamond tester with the included PU case, which provides extra durability and comfort. The compact test platform ensures stability when testing loose stones and increases accuracy and ease of use during the diamond verification process. 4. Adjustable calibration for versatility: Adjust your tests to stones of different sizes with the 'Easy Calibration' function for versatile application. This gemstone diamond tester is suitable for different gemstone sizes and delivers precise results every time you need to authenticate a gemstone.