Range: 0-9990ppm (mg/L)Resolution: 1ppm, 1 degree CelsiusATC: built-in sensor for automatic temperature compensation of 1 to 50 degrees Celsius (33 to 122 degrees Fahrenheit)Accuracy: +/-3%Auto power offDimensions: 15.5 x 3.1 x 2.3cm (6.1 x 1.25 x 1 inches)Weight: 85g (3oz)Factory calibrated to NaCl 342ppm, adjustableData holdSuitable for drinking water, water filter checks, travel, hydroponics, aquariums, food and coffee