The u-processor-based pH tester with clog-resistant cloth junction electrode specifically designed for the aquarium market. Auto shut-off after 10 minutes saves battery and extends tester life! Rugged one-piece splash proof casing. No more water infiltration! Immersible up to the LCD! SpecificationspH44 Range:0.0 to 14.0 pH Resolution:0.1 pH Accuracy:+ 0.2 pH Calibration:Automatic 2 point Battery Life:300 hours Enviroment:0 to 50C / 95% RH Max Dimensions:150 x 45 x 24 mm Warranty: Smart meters are warranted for 2 years. Electrodes are covered by a 1 year warranty.