PORTABLE DESIGN: Designed for fast, accurate and safe diamond testing. Through non-destructive testing, operation is simple and accurate. The tester is lightweight, compact (credit card size) and easy to carry . HIGH PRECISION DIAMOND TESTER: Professional diamond selector will show real diamond or fake diamond, LCD monitors and LED indicators. Compared with the second generation, its sensitivity and accuracy have been significantlyimproved. SMALL TEST PLATFORM: This tester is equipped with a PU case and a small test platform for fixing loose stones. Simple grading of gemstones of all sizes is easy for beginners. PROFESSIONAL TEST: If the stone is a real diamond, a green indicator will be displayed. The metal alarm function beeps continuously when the user accidentally touches metal instead of stone. VERSATILE: The tester features a very compact design ideal for jewelry shopping, diamond buying/selling, real estate sales, auctions, etc. The cost of Diamond Selector III is not even a fraction of the costdiamonds, but it can help you feel better knowing you're buying real diamonds instead of fakes. Features: 1. This diamond tester has a very compact design and will help you tell the difference between a real diamond and a fake diamond. 2. This tester comes with a PU case and a small testing platform to hold loose stones. 3. Indicator light and audio result. 4. Simple calibration for stones of different sizes. 5. Easy to use even for a new beginner. 6. The green indicator will be shown if the stone is a real diamond. There will be a continuous buzz when the user accidentally touches metal rather than stone Specification: Material: plastic Color: shown as pictures Size: approx. 16*4*2.1cm/6.3*1.57*0.83inch Battery: 9V battery (not included) Weight: 160g Type: Jewelry Tool Package list: 1 * Diamond Tester 1 * manual 1 * test platform