One of my favorite electrical quotes goes something like "all sensors are temperature sensors, but some are better than others". Unfortunately, I don't remember where I read this. What is the origin of the quote?
Whoever said it probably did so in person, and the odds that any of us met the true first person are low. This is the sort of engineering observation that could have been invented by several different people back in 1940, for all we know.
All sensors are temperature sensors, some measure other things as well.
An alternative, suggesting some divergence:
It has been said that all sensors are temperature sensors first.
This follows the broader observation that no real-world physical relationship or behavior is truly, fully linear across the range of all possibility. For electronic sensors, temperature is big, but humidity, pressure and acceleration pop up surprisingly often. You could say that the best sensor for one phenomenon is just exceptionally bad at sensing all the others - because anything that interacts with it does something.