SA-387S Salinity meter Waterproof Salinometer Halometer Salt Gauge Salty Brine Seawater Food Salinity Tester with retail box 40% off Features: Measure Range:0~19.99ppt Resolution:0. 01ppt Accuracy:2%F.S Operating Temperature:0~50 Temperature Compensation:0~50 Power Supply: 4X15V(AG13)(not included) Dimension:175mm30mm22mm Weight: 67g Operation: 1. Remove the protective cap 2. Turn the meter on by pressing the ON-OFF button located on the top of battery case. 3. Immerse the meter in the solution to be tested.Without exceeding the maximum immersion level. 4. Stir gently and wait for the reading to stabilize. 5. After use. rinse the electrode with water to minimize contamination.Turn the meter off by pressing the ON-OFF button.Replace protective cap after use. Calibration: Immerse the electrode into the distilled water and activate it about five minuts. Immerse the electrode in the calibration solution(6.44ppt at 25), gently shake it and wait for a stable display.Regulate the timmer with the screwdriver provided until display shows"6.44"at buffer solution temperature of 25. Rinse the electrode with distilled water, and dry it with filter paper.