Annb
Expert
Certainly no need to throw it out if you can just buy one of those for 3 euros!
My oven is an ancient gas oven, at least 70 years old, so no other way as the numbers must have worn off long before I was even born.
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Yes - I found one of these amongst some kitchen stuff Neil brought down from the loft. It does give a rough idea of the temperature, but as soon as the door is opened, the temperature drops a bit. Still, it does back up my estimates - approximately.