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 audio alerts to clearly signal 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 simple to operate. Maintenance and Care: 1. The probe is highly sensitive; handle with care and always store it in the protective sheath when not in use. 2. Replace the battery promptly when the indicator light dims. 3. Remove the battery if the device will not be used for an extended period. 4. For optimal accuracy, professional calibration is recommended annually. 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