Diamond tester device with LED indicator display and sensitivity adjustment for accurate gemstone verification USB-powered operation with included cable for convenience and reliable testing anywhere Simple sliding switch control with clear power and ready indicator lights for user-friendly testing Includes main testing unit, jeweler's loupe, and metal testing plate for comprehensive diamond authentication Compact size and lightweight construction makes it perfect for jewelers, collectors, and personal use Colour:As Shown Material:Metal Package Contents: 1set x diamond tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.