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 New Item Type: Jewelry Tool Material: Plastic + Metal Color: As Shown in the Picture Weight: Approx. 94g Battery: 2 * AAA Batteries (Not Included) Package List: 1 * Diamond Tester (Batteries Not Included) 1 * English Manual 1 * Bag 1 * Metal Tray Note: 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. Package List 1It is lightweight and compact in size (with a size of credit card), easy and convenient to carry 2Real diamond is indicated by red LED and sound 3Accurate and reliable test result, easy to read 4If diamond is fake, there will be no reaction 5With metal alert function, it will continuously emit buzzing sound when accidentally touches metal