Instructions
Press the "C" button on the right side of the Casio Pathfinder.
Hold down the "A" button on the top-left side of the Pathfinder until the display flashes.
Press the "D" button on the lower left side of the watch to cycle through the available settings until "C/F" appears.
Press the "E" button on the lower-right side to switch between "F" for Fahrenheit and "C" for Celsius.
Press the "A" button to return to the Barometer/ Thermometer screen.
Press the "D" button to return to the normal watch screen.