I have a couple 60 psi Accu-Gauge dial gauges, a Radio Shack digital gauge that was a gift, and a pencil gauge I keep in the glove compartment for just in case.
One of the dial gauges never goes out of the house and comes off the shelf only for doing comparisons.
It agrees within +/- 1 psi at 35 psi with various new, high quality gauges I encounter at work, or bought by friends etc.
It’s my master gauge.
The Rad Shack digital and the display in my car also agree with it to +/- 1 psi.
The second dial gauge goes out for checking the car and bicycle tires.
In spite of the protective rubber cover it currently reads 2-3 psi high after being bumped around over the years, so I compensate.
The pencil gauge at last check reads 2 psi low, so I made a little stick-on label (with a Brother P-touch) that says “add 2” as a reminder.