[Shop-talk] Tire Pressure Gauges

[DAVID MASSEY]

 I've tested several gauges against a calibrated gauge and I have found the electronic gauges, when they work, to be the most accurate.  And they are cheap enough to keep a few around.  Like the $10 DVM's they sell.
 
Dave 


 
 
-----Original Message-----
From: Jeff Scarbrough <fishplate at gmail.com>
To: shop-talk at autox.team.net <Shop-talk at autox.team.net>
Sent: Sun, May 29, 2022 12:11 pm
Subject: [Shop-talk] Tire Pressure Gauges

A couple of tire pressure gauge questions:
I got tired of cheap Horrible Freight tire inflators, so I sprung for a brace of Milton S-506 inflators, thinking of they were good enough for the gas station of my youth, they ought to be ok now.  One in the garage, one in the shop...they don't see a ton of use.  Last week, I was filling bicycle tires in the garage with the hotdog compressor, and couldn't get the air up sufficiently in the tire.  Finally went to get another gauge...my electronic gauge quit, and my 50 years old Bridgeport Brass gauge needs rebuilding, so I grabbed the.othwr Milton inflator.  Turns out, I had missed blowing up the bicycle tires only by a miracle of Chinese rubber.  One inflator reads 50 psi while the other one reads 90.
So, like when two inmates at the asylum both claim to be Napoleon, at least one of them is lying. And at least one will need repairing.
So, two questions:. 
1.  Any suggestions for a good reliable electronic or analog pressure gauge to verify/calibrate the inflators?  (I also need one to put in my daughter's car, so gloveboxability is a plus).
2.  Anyone ever repair a Milton (or Bridgeport) tire gauge?  Any suggestions?  The Milton's aren't very old, especially in terms of what we old guys expect from our expensive American made tools.
Bonus question:. How might one calibrate a pressure gauge against a primary source?  I'm thinking of a water column or something, but 35 psi is approximately 80 feet of water.  I'm finding that impractical for home use._______________________________________________

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