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The thermometer can be either clipped to a shelf, or submerged in a freezer or cooler to test temperature either in Celsius or Fahrenheit.
To use, unscrew the top of the thermometer to access the battery compartment and install 2 x AA batteries. Select Fahrenheit or Celsius using the "F/C" switch located within this compartment.
High and low temperatures are recorded clear every 24 hours, starting at the time when the batteries are installed.