[Dr. Curve]

Here in Florida, possibly because of the Areo Space Industry and such, there are multiple places where one can send their gauge to be calibrated.........if the gauge is of high enough quality in the first place. Snap On recommends that theirs be re-calibrated every three years or so.........if you simply must have it perfect and consistent every time. Some of us want it that way, not that we need it.......we just want it right every time. I have been using Nitrogen in my tires for over thirty years, but only because I want it just right every time I go out to hunt.