I've had good luck with these:
https://www.amazon.com/Accutire-MS-4021B-Digital-Pressure-Gauge/dp/B00080QHMM/ref=asc_df_B00080QHMM/?tag=hyprod-20&linkCode=df0&hvadid=312177448019&hvpos=&hvnetw=g&hvrand=16563417771390584939&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9032278&hvtargid=pla-567122411030&psc=1&tag=&ref=&adgrpid=61495038909&hvpone=&hvptwo=&hvadid=312177448019&hvpos=&hvnetw=g&hvrand=16563417771390584939&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9032278&hvtargid=pla-567122411030
You don't know for sure how accurate a gauge is unless you compare it to
a lab standard, but repeatability is a good sign, and these always do.
FWIW, they agree with the TPS monitor in my Mustang.
Bob
On 5/29/2022 10:11 AM, Jeff Scarbrough wrote:
> 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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