I use the Slime gauges, have several and swap them around. I use the one that's closest to hand. Every once in a while I gather them all up and check to make sure they're all reading the same. I also have several other brands, all digital except the dually gauge. And I have one dial gauge that gets used to check with the digital gauges. I had a couple of them that had replaceable batteries but one broke and the other one is MIA.
I quit using pencil gauges quite a few years ago. And spending big bucks on a tire pressure gauge doesn't make much sense to me.
Howard and Peggy
"Don't Panic"