I have a bunch of calipers mostly lying in handy places, hate running out to the shop when needed else were. Favorite is a Brown & Sharp with a black face. Have two Harbor Freight digitals which work well, I did get one that was off quite a bit and returned. Mititoyo has been a good one. Have a cheap 6” in my shooting box that has come in handy a few times through the years at Friendship though not as accurate as I would like. All have been checked with gages used for my mikes. The important thing keep them clean, close don’t leave open to get dirt in the track, wipe the jaws before use. If off clean and re-calibrate with the instructions that came with them. I fear my Brown and sharp jaw tips are showing some wear. Seems like I have a habit of using them doing layout work scribing lines after bluing the work.