Even though I don't understand the spoken language, I can see from the video that this is the process for changing the setting between C and F. > Turn off thermometer by Pressing the button, so that the readout window is blank. > Press and Hold the button until the C or F starts to flash, and then changes to the opposite setting of F or C. > If the setting keeps flashing the same letter, for example C-C-C... then your thermometer is only built to register that temp scale. Thank you Kamal for posting this video, as my thermometer did not arrive with any instructions.