<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Many years ago I worked in the Chemical Engineering Department at UT Austin & in their main lab they had an hydraulic/weight calibrator for pressure gauges. If you have a university nearby you might give them a call. Rather than calibrate the entire gauge, you could just find out what one gauge reads @ the tire pressure you use & calibrate any other ones to that gauge. <div><br></div><div>Peace, Pat</div><div><br></div><div><div dir="ltr">Pat Horne <div>We support Habitat for Humanity</div><div><br></div></div><div dir="ltr"><br>On Apr 26, 2024, at 5:36 PM, Bob Spidell <bspidell@comcast.net> wrote:<br><br></div><div dir="ltr">
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I can name at least one place off the top-of-my-head that can
calibrate torque wrenches, but not one that I know of that can
calibrate pressure gauges (I do think some laboratories can do it).<br>
<br>
I have several analog gauges that don't agree (one is adjustable). I
have 3 Accutire digital gauges that all agree with each other and my
Mustang's TPMS; at least I have repeatability. I set tire pressure
according to how the tires wear.<br>
<br>
<br>
<div class="moz-cite-prefix">On 4/26/2024 10:26 AM,
<a class="moz-txt-link-abbreviated" href="mailto:alfuller194@gmail.com">alfuller194@gmail.com</a> wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt">Sorry for
the late reply – I have no idea where several weeks’ worth
of messages have been hanging out!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">It might be
worth checking with someone who already has their gauges
calibrated and comparing readings. I would hope the new car
dealers service department would actually calibrate gauges
used on customer cars, but would ask to be sure. It also
occurs to me that last time I moved the movers damaged my
air compressor, and the insurance company has a local
company that repairs them. I wonder if they have calibrated
gauges, and if one could compare readings with theirs…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">-----------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">All
the best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Al
Fuller<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">
Shop-talk <a class="moz-txt-link-rfc2396E" href="mailto:shop-talk-bounces@autox.team.net"><shop-talk-bounces@autox.team.net></a> <b>On
Behalf Of </b>Jeff Scarbrough<br>
<b>Sent:</b> Sunday, April 7, 2024 1:13 PM<br>
<b>To:</b> Benjamin Zwissler <a class="moz-txt-link-rfc2396E" href="mailto:bjzwissler@gmail.com"><bjzwissler@gmail.com></a><br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:Shop-talk@autox.team.net">Shop-talk@autox.team.net</a><br>
<b>Subject:</b> Re: [Shop-talk] Tire Gauges<o:p></o:p></span></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal">If you had some mercury, a 5 foot
column should do the trick. Don't tell the EPD, though.<o:p></o:p></p>
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<p class="MsoNormal">On Sun, Apr 7, 2024, 15:37 Benjamin
Zwissler <<a href="mailto:bjzwissler@gmail.com" moz-do-not-send="true" class="moz-txt-link-freetext">bjzwissler@gmail.com</a>>
wrote:<o:p></o:p></p>
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<p class="MsoNormal">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. <o:p></o:p></p>
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<p class="MsoNormal">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. <o:p></o:p></p>
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<p class="MsoNormal">Any ideas on creating a low
cost pressure standard for calibration?<o:p></o:p></p>
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<p class="MsoNormal">Ben <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Sun, Apr 7, 2024, 1:49<span style="font-family:"Arial",sans-serif"> </span>PM Jeff
Scarbrough <<a href="mailto:fishplate@gmail.com" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">fishplate@gmail.com</a>>
wrote:<o:p></o:p></p>
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<p class="MsoNormal">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.<br>
<br>
Is there a simple way to check accuracy? <o:p></o:p></p>
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<p class="MsoNormal"> Jeff <o:p></o:p></p>
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