I hope necro bumps are tolerated around here. I wanted to share my experience with some of the tools and brands discussed here.
I bought a pair of iGaging Absolute Origin calipers and have been happy with their performance. A big step up from HF.
I bought one a few weeks ago and use it in a cnc machine shop. I tested it with pin gages, a block gage, and compared it to an Insize caliper and the results were as good as could be expected with a caliper. In hand it feels the same as a Mitutoyo to me, although I haven't tested the Mitutoyo caliper yet, and the Mitutoyo caliper. Not sure it would really be fair since that Mitutoyo was IP65 rated instead of IP54 for the iGaging. I also tested a couple digital Mitutoyo micrometers and a vernier Insize micrometer, and the caliper was very close for a caliper. Fwiw, the iGaging SpeedMic mike performed as well as the Mitutoyo's and Insize. If you're into SPC, they use the same plug. I'll be checking if their compatibility extends further.
My biggest problem with iGaging is that the company is incredibly slow to communicate. They have no catalog online, so I contacted them to find out that they really have no complete catalog. I want to order a few things, so I have to give them my dream sheet and hope that they have what I want. I'm still waiting a week later. That's really bad for sales, and that makes me hope I never have to deal with their customer service.
So I'll recommend Insize as well. If you use SPC, their tools appear to use a cheap USB cable that can be hooked up directly to a computer without the ~$100 interface cable that the tools from some other companies require.
I recommend against Pittsburgh from Harbor Freight. It's gritty, has way too much flex, the battery covers aren't secure and the screen is easier to crack. It can take precision measurements, but you'd do well to practice taking measurements against something like a gage block to verify how much pressure to apply with this flexible caliper.