I had this "genius" idea of putting an Arduino Nano with a cheap rf transmitter and LM35 temperature sensor, in an oven.
It's in an aluminium enclosure from Rolec. Powered by 4 AA batteries (which was a bad idea, now that I think about it)
So i crank the oven to full grill mode. In no less than 10 minutes, Max is showing 102° Celsius.
I then filled a whatchamacallit with cold water and reached for the hot aluminium box in the oven.
It sizzled when i dropped it in.... and the arduino, sensor and the rf transmitter still worked! Even tho the metal had expanded which then let the water in.
After a bit of cooling
I didn't log the data unfortunately, there just this graph.
But it did reach ~123° Celsius. It's pretty impressive for a this kind of tech to still be working and sending out bits from inside a relatively thick aluminium case, from an oven, at 120 celsius.