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I suppose if you can calibrate it to view through thick glass panel...
Agreed on the tc... there are ways and means to make that variation as little as possible... but it is still there and you...

The saying goes... loosely translated from afrikaans. You dont know until you measure... as long as you know what you measure...

More poetic in aftikaans though...

Mmm... a tc of the same range is below 50 us... a good one... my ht oven will be less than 500 us after i built it... i think for a forge it would be useful... but you can just get a cheapy......

The ones that are able to do high temps are quite expensive if you want any sort of accuracy... when i last checked.... and the door must be open to measure...