Incredibly accurate! A pH tester that is perfect for both consumer or commercial use. Ideal for all pH testing, water purification applications, waste water regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment, wine, coffee, agriculture and more. FACTORY 2 YEAR WARRANTY PH Range: -2 - 16Temperature Range: -5.0 - 105.0 °C; 23-221 °F Resolution: 0.01 pH; Temperature: 0.1 deg C/F Accuracy: +/- 0.02 pH Calibration: AUTO IN 1 OR 2 POINTS W/ MEMORIZED STANDARD AND NIST BUFFER SETS. AUTO POWER OFF SAVES BATTERY POWER AFTER NON-USE Electrode: EASILY Replaceable Just unscrew and screw on new one!Housing: Waterproof (submersible, floats) Power source: 4 x 1.5V button cell batteries (included) Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches) Weight without case: 96.4g (3.4 oz) 1 PH-200 pH/Temp. meter with cap Batteries LEATHER CARRYING CASE PH 4.01 BUFFER SOLUTION PH 7.01 BUFFER SOLUTION