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 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 construction makes it ideal for jewelers, collectors, and personal use. Color: As shown. Material: Metal. Package contents: 1 set * diamond tester. Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product. Measurement may vary by +/- 1-3 cm.