These vernier calipers are always hard to interpret completely accurately, but this one seem pretty good. Its a great shop tool to verify a bolt to a drill bit or wrench and things like that. Stainless, so I don't have to knock the rust off.
Pros
I use mine for reloading. Doesn't use batteries, and doesn't get out of calibration.
Cons
The caliper's finer measurement increments can be challenging to read, particularly in low-light situations.