We've got 4 new NAPA tire gauges in the last year. Two of them were junk. One wouldn't read anything under 90 PSI. The other would read 30 PSI at 40, and by the time the tire hit 80, it was reading about 54.
The other two new gauges read within 2 PSI of every other gauge on the place at 80 PSI.
Because it's new and high-dollar doesn't guarantee accuracy.