Features: With highly efficient and accurate, the salinometer has measuring range of 0~199.9ppt and +/- 2%F.S accuracy. Lightweight and portable, its high precision LCD displays the measurement result clearly. The simple designed salinity meter is easy to operate, and measure your water quality within seconds. Easy to calibrate with the included small screwdriver. For measuring water quality in pools and aquariums, widely use in the industrial areas, agricultural production and marine aquaculture industry, etc. Specifications: Material: ABS Range: 0~199.9ppt Resolution: 0.1ppt Accuracy: ±2%F.S Power Supply: 4 * LR44 button battery (NOT included) Temperature Compensation: 0~50°C Operating Temperature: 0~50°C Item Size: 165 * 50 * 28mm / 6.49 * 1.97 * 1.10in  Item Weight: 56g / 1.97oz  Package Weight: 133g / 4.69oz  Package Size: 25 * 10.5 * 5cm / 9.84 * 4.13 * 1.97in  Package List: 1 * Salinity Meter 1 * Slotted Screwdriver 1 * Manual (English)