Where would one get a pressure gauge calibrated? When I worked in the lab our load cells and torque wrenched were sent out to calibration every few months and before and after every big test program, but we never used air pressure gauges.

Tire vendors at the track often have one set up for teams to use. In everyday life, I have no idea.

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Tire Rack also sells the Intercomp digital tire gauge that is supposedly calibrated and tested. Maybe Intercomp would test and re-calibrate it's gauges if they're sent back in?

To sum it all up-compared the new to the old-I threw 4 away.
It is not scientific-law of averages.
I now have three that read the same.

I have 2 sets of CIS gauges, both purchased at the same time (they sent me 2 by mistake and told me to keep it). at higher pressures they DO NOT measure the same psi.

I have thought about the same with a tire pressure gauge since I just bought a nice one to go racing with.

I figure its all relative. that is, if you determine 20psi is what you need for cold pressure, then as long as you ONLY use that gauge, you will never know or care if it is accurate or not. you just need it to be consistent.

It doesn't matter if they are digital or analog, you will need to calibrate them against a known standard.

I flatten all four tires...get a zero reading first on all....digital or analog. Tires must be cold to ensure accuracy....YMMV.

How do you calibrate a gauge?

If yer not setting race tire pressure....just check a new one with your four tires. I want a consistent reading....say at 35 PSI....the actual accuracy of the #...ball park close is OK enough...for me.

Calibrating is when you can dial it in to be correct.

I can use the super computer between my ears and get the same result...as long as it is condistent....

Calibrate me now....or calibrate me later :)

Most good gauges have screws for changing/adjusting the zero and span. Cheap ones will not.

I'm screwed ;)

Don't remember the tire-gauge brand but the dial says Ashcroft on it.
It is very accurate!
My mechanic gave it to me when i started autocross. Told me accurate tire pressures are very important.

Someone needs to do an R&R sudy....

Like this one ??
:D

http://forums.pelicanparts.com/uploa...1562605206.jpg

There’s a couple of ways of calibrating them . Most common being Dead weight , or a calibrated by pumping against a calibrated “base gauge “ or calibrated transducer and fluke etc
Never put my tire gauge on a deadweight , but calibrated against a crystal when new and it was dead on .
Edit : it’s a long acre btw

http://forums.pelicanparts.com/uploa...1562605206.jpg

You would have to go back to first principles. Get a Tube with a piston in it - like a tire pump. Calculate the area of the piston, say it’s 2 square inches. Connect your gauge to the hose, put weights on the handle 100 lb would give you an accurate 50 psi.

IIRC, NIST uses manometry for this range of pressures.

Here is a scientific instrument house:
https://www.coleparmer.com/p/nist-traceable-pressure-gauges/59678

I dunno what the engineers use. But I do know you can git as deep as ya wanna with this...

And all this science I don't understand .
It's just my job five days a week .