Any Recommendations on a 1/2" Digital Torque Wrench?

Beam torque wrenches are always spot on as long as they point to zero at rest. Clickers and digitals are always circumspect, best way to check them is with a beam wrench.

As for dial calipers, you have to keep them closed when not using them to keep the gear rack and pinion gear clean or dirt will wear them out prematurely. I have worn a out a few, but my eyes are not good enough anymore to read a vernier scale so that is what I use. Best to lube the gear and rack with graphite once and a while. Remember, nothing is as accurate as a micrometer.