Highly Sensitive Tester: Professional Diamond Selector III displays real or fake diamonds, LCD screen and LED display. Compared to Generation II, the sensitivity and accuracy have been significantly improved. Fast Testing and Portable Design: It is designed for fast, accurate and safe diamond testing. Through non-destructive testing, it is easy and accurate to use. With metal warning function, it will keep buzzing sound when accidentally hit the metal. The tester is light and compact (with a credit card), easy and convenient to carry. Loud and readable alarm: emits audible noises to easily distinguish the measurements. Portable electronic device for distinguishing real diamonds from other synthetic stones. The real diamond is indicated by the red LED and sound. Accurate and reliable test result, easy to read. If the stone is an artificial crystal, a simulant such as cubic zirconia (zirconia) is not a reaction.Scope of delivery: 1 x diamond tester (batteries not included), 1 x instruction manual, 1 x bag, 1 x metal tray Note: The data are all manual measurement, please allow some error 1 - 3cm, due to the light and display difference, there will be some color difference, depending on the physical object received.