When you find an inflation pressure you like, it doesn't matter what that number is on a gauge as long as you repeatedly get to that pressure. If the gauge reads 5 - 10 psi different each time you measure the same tire, that is a big deal and not acceptable.
+whatever for the SKS gauge.https://www.sks-germany.com/en/products/airchecker/
I've had lots of gauges over time (i.e. I'm old) and this may be my favorite.
It does have the capability of measuring the pressure from both schrader and presta valves but the head has two openings, one for schrader and one for presta, not one opening that measures both.
Yup - I think you are right. 2nd day on my tubeless Maxxis Ramblers and I'm starting to dial in the ideal pressure. Big difference between the feel of the tubeless Ramblers and the stock Kenda Happy Mediums. I'm not sure if it's the lower pressure, tubeless set up, or the quality of the tire -- but the Ramblers are much smoother on bumpy roads, and seem to to roll better -- even on pavement.