Could I use a meat thermometer to measure the heat of a challa dough while baking? Will it render the challa ‘meaty’?
Ideally one should not use the meat thermometer to measure the heat of the challa dough when the meat thermometer is within 24 hours of being used with hot meat (“ben yomo”) even if you plan on eating the bread with meat.
After the thermometer has not been used for 24 hours, you can use the thermometer even in you plan on eating the bread with dairy (unless you have access to a different thermometer).
In a case of necessity, i.e. it will be significantly difficult for you to bake without the thermometer and you cannot wait the prerequisite 24 hours, the thermometer may be used and the bread should not be eaten with dairy.
All the best