1. Sometimes the factory will do a interchange printing in F and C display mode, We will send the randomly display mode to you, sorry.
2. If the thermometer is not in accuracy condition, please use a screwdriver to adjust the slot of backside, easy doing it
Mechanical Type Window Stick-on Thermometer Without batteries
sticks directly onto the outside of a window with the adhesive pads supplied.
The outside temperature can then be read while you are indoors. Mercury free.
Range: -40° C to +50° C.