thermometer offpress & hold down the <start> button or <1/0> button - after 3 secs the display will show this sequence C / SET/F/SET

release the start button when F is showing - there will be a short beep to confirm new setting -then therm is turned off automatically
when turned on again - temp will show in F - until above procedure repeated

....I got one given to me last week and haven't used it opened it for instructions hope it helps

Hope Gussy is feeling better soon