Product Features: This diamond tester features a compact design for fast, accurate, and safe diamond testing, making it ideal for portable use when purchasing diamonds. The device indicates whether a diamond is genuine or simulated, allowing users to quickly and easily interpret test results. Equipped with LED lighting and o alerts to clearly indicate test outcomes. This diamond tester is a precision electronic instrument designed for use in environments between 5-35°C with relative humidity under 80%. Gems must be clean, dry, and at room temperature for accurate testing. The testing process is non-destructive and user-friendly. Maintenance and Care: 1. The probe is highly sensitive; handle with care and store in the protective sheath when not in use. 2. Replace the battery when the indicator light dims, signaling low power. 3. Remove the battery if the device will not be used for an extended period. 4. For optimal accuracy, annual calibration is recommended. Specifications: Color: Black Power Supply: 1 x DC 9V Battery (not included) Item Size: 16 x 4 x 2.2 cm (6.6 x 1.6 x 0.8 in) Package Contents: 1 x Diamond Selector II Tester 1 x Protective Leather Case 1 x Testing Platform 1 x User Manual