[Shop-talk] Tire Gauges

[Jeff Scarbrough]

I know that one foot of water column equals 0.433 psi.  So about 70 feet of
2" pipe attached to the side of a tall building with a thin diaphragm over
a chamber with a Schrader valve should get you close.  Might need to make a
manometer out of it, so you'll need more pipe.

It's low cost, but not very practical.   I did have a set of weights and an
oil reservoir for calibrating liquid pressure, but liquids are not (for our
purposes) compressible and air is.  So I don't know how accurate that might
be.

If you had some mercury, a 5 foot column should do the trick.  Don't tell
the EPD, though.



On Sun, Apr 7, 2024, 15:37 Benjamin Zwissler <bjzwissler at gmail.com> wrote:

> I calibrate my Milton (which has consistently read high) to my wife's tpms
> value.   Partly because I assume the car is right and partly because I
> don't like it when she's telling me a week later that she's getting low
> pressure lights again.
>
> I don't know how to create an inexpensive standard for calibration.   The
> Milton is the most expensive gauge I have and has been the least accurate.
> I looked it up on line and found lots of similar complaints about its
> inaccuracy.
>
> Any ideas on creating a low cost pressure standard for calibration?
>
> Ben
>
>
>
>
> On Sun, Apr 7, 2024, 1:49 PM Jeff Scarbrough <fishplate at gmail.com> wrote:
>
>> So, I have three tire gauges:  Accutire electronic, Jayco mechanical, and
>> Milton Inflator hose with gauge.  All three report consistently, and all
>> three are 3-4 psi different - low to high in the above order.
>>
>> Is there a simple way to check accuracy?
>>
>>     Jeff
>>     Corrosion Acres, Ga.
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