Product review (3 stars): Does what it needs to
There is no option to turn the meter off. They arrived fully powered and on.

This comes only in Celsius. But I don't need to know that anyways. If you do here's the conversion equation:
T(C) = Temp in Celsius
T(F) = Temp in Fahrenheit
T(C)  1.8 + 32 = T(F)