General Tools DKP300MA Digital Waterproof Keypad Thermometer The DKP300MA Digital Waterproof Keypad Thermometer reads surface temperature The industrial digital thermometer has a wide measurement range from -58 degrees to 302 degrees Fahrenheit and can also show readouts in Celsius Pool thermometer high and low alarms alert when temperature has stooped low or peaked too high; features both min and max memory along with data hold Stainless steel sensor probe and protective plastic cap for thermometer probe ensure that probe thermometer is sure to remain protected/long lasting Pocket thermometer comes with a pocket clip and is CE approved; power source is 1 LR44 battery (included) with auto power-off for saving battery life Waterproof thermometer is perfect for aquarium maintenance, whirlpool therapy and pool maintenance