There seem to be many schools of thought. Can someone please tell me a tried and tested way of testing oven temperatures on conventional and fan ovens please , please , please.
Is it oven internal temperatures or external surface temperatures you are after? Bryan has given the basic method of doing the surface temperature test.
this takes a while but seem to work put therm probe in middle of oven set to low temp say 75 allow stat to cut in/out twice then take the next cut in and cut out reading average it and plot it against the knob setting turn up to 100 and repeat etc Ive had to do this a few times to prove stats were working ok and it has always put the customers mind at rest I think this procedure is in an old creda book somewhere.