Unless you compare your pressure gauge to one that has recently gone through calibration, you still don't know if it is accurate. "New, high quality" does not mean accurate!
When I was an active aircraft mechanic, ALL of my PME (precision measuring equipment) had to have an annual calibration check. That included my tire pressure gauge (a Blue Point from the Snap-On truck). It passed every year.
Sadly, after nearly 30 years of use and abuse, my half inch drive torque wrench failed calibration, could not be recalibrated, and had to be replaced!
Although my tire pressure gauge has not been verified since I retired, I still trust it.
