Features: Portable design and non-slip rubber handle for easy operation. Built-in Automatic Temperature Compensation (ATC) for faster results. With measuring level for direct reading. Adjustable manual focus, easy to focus and calibrate. Comes with a case, convenient for storage and portable for use. Measure salt water or water salinity, ideal for aquariums and marine monitoring. Instant reading result: just need 2-3 drops of solution and in a few seconds you can get accurate readings. Specifications: Color: Black + Silver + Blue Material: ABS *Measuring Range: Salinity: 0-100 Specific Gravity: 1.000-1.070 Accracy: 1 ATC - Automatic Temperature Compensation Item Size: Shown as picture Package Size: Approx. 20.5 * 7.5 * 5.5cm / 8.1 * 3 * 2.2in Package Weight: Approx. 230g / 8.11oz Note: 1. After use, do not wash directly with water. Wipe with a clean soft cloth. The optical surface should not be scratched. 2. The instrument should be stored in a dry place without corrosive gas. 3. Avoid missing parts. Package List: 1 * Salinity Refractometer 1 * Slotted Screwdriver 1 * Cleaning Cloth 1 * Straw 1 * User Manual 1 * Packing Box