That's interesting. Been a long time since I thought about strain gages - which is what must be in them.
The digital is often convenient, but I rely on the sound and feel when wrenching most of the time. The digital's warning sound is tricky to use consistantly.
The QA guys that come in from the DoD and check stuff from time to time told us that the theory is that as the batteries drain, their tolerances on their readouts increase. Which I’m not sure I fully buy that theory.
