OK, so most of us can tell if the garage is too cold to work but it’s useful to know the ACTUAL temperature sometimes. Enamels don’t dry properly if its too cold and you end up with a tacky surface that can take weeks to go off for example. Aerosol primers can go tack dry on the surface but not solidify underneath if they are layered on quite heavy, then it can cause crazing in your surface coat. Of course, for painting your bodywork you will definitely need to be at the right temp.
So, this real wood classic thermometer does the job and you can stain the wood so it looks as old as your classic!