This is a portable electronic diamond tester for distinguishing real diamonds from other simulated stones. It is designed for quick, precise, and safe diamond testing. With non-destructive testing, it is easy and accurate to operate. Being as a pocket tester, it is easy to carry.Features:1. It is lightweight and compact in size (with a size of credit card), easy and convenient to carry.2. Real diamond is indicated by red LED and sound.3. Accurate and reliable test result, easy to read.4. If diamond is fake, there will be no reaction.5. With metal alert function, it will continuously emit buzzing sound when accidentally touches metal.6. Testing platform for loose stones.Specification:Condition: 100% Brand NewItem Type: Jewelry ToolMaterial: Plastic + MetalColor: As Shown in the PictureWeight: Approx. 94gBattery: 2 * AAA Batteries (Not Included)Package List:1 * Diamond Tester (Batteries Not Included)1 * English Manual1 * Bag1 * Metal TrayNote:Diamond selector III can measure the different heat conductivity of individual stones and distinguish it through just one-touch simple operation. However, those stones with similar heat conductivity to the natural diamonds can not be distinguished.