Last year I was at the track and left my tire guage at home. So I borrowed a digital tire guage from a friend of mine. I than went ahead and checked my tires with a few other people who had different style gauges. Than I was wondering who’s was accurate. They where all within a 1lb difference. The few digital gauges were close to each other. When I went home I checked the air psi with my guage which was brand new. It was a liquid filled guage that I just purchased. I sent the guage back and purchased an Intercomp digital tire guage for a couple $$$ @ JC Specialty. I wouldn’t trade the guage for nothing else.
Hope this helps.