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pH - measure the Acidity and Basicity of a solution. EC - measure the Electrical Conductivity of water that is use to help indicate water purity. TDS - indicate the Total Dissolved Solids in a solution that is also an aid in many water analysis procedure. Salinity - measure of the concentration of dissolved salts in water. Temperature - knowing the temperature in water is an essential key factor in water analysis. Temperature influences the rate of chemical and biological reactions. Features 5-in-1 water quality tester With backlight function Low battery indicator Replaceable electrode Factory pre calibrated HOLD function IP67 waterproof level Selectable temperature unit (°C/°F) Specifications: Measurement range: pH: 0.01~14.0pH; 0.01pH resolution; ±0.05pH accuracy EC: 0~10000µS/cm, 10.01~19.99mS/cm, 20.1~400mS/cm (convert range automatically); 1µS/cm, 0.1mS/cm resolution; ±2% F.S. accuracy TDS: 0~10000ppm, 10.1~200.0ppt (convert range automatically); 1ppm or 0.1ppt resolution; ±2% F.S. accuracy Salinity: 0.01~25.0%, 0~10000ppm, 10.1~200.0ppt; 0.01%, 1ppm, 0.1ppt resolution; 0.01~5.0% (±0.1%), 5.10~25.0% (±1%), others (±2%F.S.) accuracy Temperature: 0.1~60°C (32~140°F); 0.1°C/°F resolution; ±0.5°C accuracy Calibration (Automatic Calibration) EC: 3 points calibration ( optional solution 1413µS/cm, 12.88mS/cm, 111.8mS/cm) pH: 3 points calibration and recognize standard solution automatically (6.86pH, 4.0pH, 9.18pH) ATC: 0~60°C Waterproof Level: IP67 Operating Environment: 0~60°C (32~140°F); 100%RH TDS Factor: 0.4~1.0 Automatic Shut-off: 5min with no operation Battery: 3 x 1.5V (LR44) button size battery Screen Size: approx. 33 x 24mm Meter Size: approx. 183 x 37 x 37mm (7.2 x 1.5 x 1.5in) Weight: approx. 90gms (3.2oz) Set Includes: 1 x Multifunction Tester 3 x pH Buffer Powder English Instruction Manual Standard factory packagin