Accuracy: +/- 2% TDS Range: 0 to 9990 ppm (mg/L) Range: 0 to 80 degrees Celsius Resolution: 0-999: 1 ppm; 1000-9990: 10 ppm Temperature Resolution: 0.1 degree Celsius (Celsius only) EC-to-TDS Conversion Factor: NaCl (avg. 0.5) ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50 degrees Celsius (33 to 122 degrees Fahrenheit) Power source: 2 x 1.5V button cell batteries (included) (LR44 or equivalent) Battery life: 1000 hours of usage Dimensions: 15.5 x 3.1 x 2.3cm (6.1 x 1.25 x 1 inches) Weight with case: 76.5g (2.7 oz) Weight without case: 56.7g (2 oz)