Subject: Re: [Shop-talk] Tire Gauges

From: Benjamin Zwissler <[email-masked]>
Date: Sun, 7 Apr 2024 15:37:39 -0400

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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=E2=80=AFPM Jeff Scarbrough <[email-masked]> =
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.
> _______________________________________________
>
> [email-masked]
> Donate: http://www.team.net/donate.html
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> http://autox.team.net/mailman/options/shop-talk/[email-masked]
>
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<div dir=3D"auto"><div>I calibrate my Milton (which has consistently read h=
igh) to my wife&#39;s tpms value.=C2=A0 =C2=A0Partly because I assume the c=
ar is right and partly because I don&#39;t like it when she&#39;s telling m=
e a week later that she&#39;s getting low pressure lights again.=C2=A0<div =
dir=3D"auto"><br></div><div dir=3D"auto">I don&#39;t know how to create an =
inexpensive standard for calibration.=C2=A0 =C2=A0The Milton is the most ex=
pensive gauge I have and has been the least accurate. I looked it up on lin=
e and found lots of similar complaints about its inaccuracy.=C2=A0</div><di=
v dir=3D"auto"><br></div><div dir=3D"auto">Any ideas on creating a low cost=
 pressure standard for calibration?</div><div dir=3D"auto"><br></div><div d=
ir=3D"auto">Ben=C2=A0<br><div dir=3D"auto"><br></div><div dir=3D"auto"><br>=
</div></div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gm=
ail_attr">On Sun, Apr 7, 2024, 1:49=E2=80=AFPM Jeff Scarbrough &lt;<a href=
=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br></div=
><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex"><div dir=3D"ltr">So, I have three tire gaug=
es:=C2=A0 Accutire electronic, Jayco mechanical, and Milton Inflator hose w=
ith gauge.=C2=A0 All three report consistently, and=C2=A0all three are 3-4 =
psi different - low to high in the above order.<br><br>Is there a simple wa=
y to check accuracy?=C2=A0=C2=A0<div><br></div><div>=C2=A0 =C2=A0 Jeff=C2=
=A0<div>=C2=A0 =C2=A0 Corrosion Acres, Ga.</div></div></div>
_______________________________________________<br>
<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank" rel=3D"norefe=
rrer">[email-masked]</a><br>
errer" target=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/shop-talk" rel=3D"norefer=
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ttp://autox.team.net/mailman/options/shop-talk/[email-masked]</a><br>
<br>
</blockquote></div></div></div>

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Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive

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From: Jeff Scarbrough <[email-masked]>
Date: Sun, 7 Apr 2024 16:13:10 -0400

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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 <[email-masked]> wrote:

> I calibrate my Milton (which has consistently read high) to my wife's tpm=
s
> Milton is the most expensive gauge I have and has been the least accurate=
.
> On Sun, Apr 7, 2024, 1:49=E2=80=AFPM Jeff Scarbrough <[email-masked]=
> wrote:
>
>> So, I have three tire gauges:  Accutire electronic, Jayco mechanical, an=
d
>> Is there a simple way to check accuracy?

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<div dir=3D"auto">I know that one foot of water column equals 0.433 psi.=C2=
=A0 So about 70 feet of 2&quot; pipe attached to the side of a tall buildin=
g with a thin diaphragm over a chamber with a Schrader valve should get you=
 close.=C2=A0 Might need to make a manometer out of it, so you&#39;ll need =
more pipe.<div dir=3D"auto"><br></div><div dir=3D"auto">It&#39;s low cost, =
but not very practical.=C2=A0 =C2=A0I did have a set of weights and an oil =
reservoir for calibrating liquid pressure, but liquids are not (for our pur=
poses) compressible and air is.=C2=A0 So I don&#39;t know how accurate that=
 might be.</div><div dir=3D"auto"><br></div><div dir=3D"auto">If you had so=
me mercury, a 5 foot column should do the trick.=C2=A0 Don&#39;t tell the E=
PD, though.</div><div dir=3D"auto"><br></div><br><br><div class=3D"gmail_qu=
ote" dir=3D"auto"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Apr 7, 2024=
, 15:37 Benjamin Zwissler &lt;<a href=3D"mailto:[email-masked]">bjzwi=
[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div=
 dir=3D"auto"><div>I calibrate my Milton (which has consistently read high)=
 to my wife&#39;s tpms value.=C2=A0 =C2=A0Partly because I assume the car i=
s right and partly because I don&#39;t like it when she&#39;s telling me a =
week later that she&#39;s getting low pressure lights again.=C2=A0<div dir=
=3D"auto"><br></div><div dir=3D"auto">I don&#39;t know how to create an ine=
xpensive standard for calibration.=C2=A0 =C2=A0The Milton is the most expen=
sive gauge I have and has been the least accurate. I looked it up on line a=
nd found lots of similar complaints about its inaccuracy.=C2=A0</div><div d=
ir=3D"auto"><br></div><div dir=3D"auto">Any ideas on creating a low cost pr=
essure standard for calibration?</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Ben=C2=A0<br><div dir=3D"auto"><br></div><div dir=3D"auto"><br></=
div></div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmai=
l_attr">On Sun, Apr 7, 2024, 1:49=E2=80=AFPM Jeff Scarbrough &lt;<a href=3D=
"mailto:[email-masked]" target=3D"_blank" rel=3D"noreferrer">fishplate=
@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=
=3D"ltr">So, I have three tire gauges:=C2=A0 Accutire electronic, Jayco mec=
hanical, and Milton Inflator hose with gauge.=C2=A0 All three report consis=
tently, and=C2=A0all three are 3-4 psi different - low to high in the above=
 order.<br><br>Is there a simple way to check accuracy?=C2=A0=C2=A0<div><br=
></div><div>=C2=A0 =C2=A0 Jeff=C2=A0<div>=C2=A0 =C2=A0 Corrosion Acres, Ga.=
</div></div></div>
_______________________________________________<br>
<br>
<a href=3D"mailto:[email-masked]" rel=3D"noreferrer noreferrer" t=
arget=3D"_blank">[email-masked]</a><br>
errer noreferrer" target=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/shop-talk" rel=3D"norefer=
rer noreferrer noreferrer" target=3D"_blank">http://www.team.net/pipermail/=
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oreferrer noreferrer" target=3D"_blank">http://autox.team.net/archive</a><b=
r>
<br>
alk/[email-masked]" rel=3D"noreferrer noreferrer noreferrer" target=
=3D"_blank">http://autox.team.net/mailman/options/shop-talk/bjzwissler@gmai=
l.com</a><br>
<br>
</blockquote></div></div></div>
</blockquote></div></div>

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From: <[email-masked]>
Date: Fri, 26 Apr 2024 10:26:58 -0700

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Sorry for the late reply =E2=80=93 I have no idea where several =
weeks=E2=80=99 worth of messages have been hanging out!

=20

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=E2=80=A6

=20

-----------------------------------

All the best,

=20

Al Fuller

=20

From: Shop-talk <[email-masked]> On Behalf Of Jeff =
Scarbrough
Sent: Sunday, April 7, 2024 1:13 PM
To: Benjamin Zwissler <[email-masked]>
Cc: [email-masked]
Subject: Re: [Shop-talk] Tire Gauges

=20

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.

=20

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.

=20

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

=20

=20

On Sun, Apr 7, 2024, 15:37 Benjamin Zwissler <[email-masked] =

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.=20

=20

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.=20

=20

=20

Ben=20

=20

=20

=20

On Sun, Apr 7, 2024, 1:49=E2=80=AFPM Jeff Scarbrough =

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? =20

=20

    Jeff=20

    Corrosion Acres, Ga.

Archive: http://www.team.net/pipermail/shop-talk =
http://autox.team.net/archive

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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>Sorry for the late reply =E2=80=93 I have no =
idea where several weeks=E2=80=99 worth of messages have been hanging =
out!<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'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=E2=80=A6<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>-------------=
----------------------<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>All the =
best,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Al =
Fuller<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Shop-talk &lt;[email-masked]&gt; <b>On Behalf Of =
</b>Jeff Scarbrough<br><b>Sent:</b> Sunday, April 7, 2024 1:13 =
PM<br><b>To:</b> Benjamin Zwissler =
&lt;[email-masked]&gt;<br><b>Cc:</b> =
[email-masked]<br><b>Subject:</b> Re: [Shop-talk] Tire =
Gauges<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=3DMsoNormal>I know =
that one foot of water column equals 0.433 psi.&nbsp; So about 70 feet =
of 2&quot; pipe attached to the side of a tall building with a thin =
diaphragm over a chamber with a Schrader valve should get you =
close.&nbsp; Might need to make a manometer out of it, so you'll need =
more pipe.<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>It's low cost, but not very practical.&nbsp; &nbsp;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.&nbsp; So I don't know how accurate that might =
be.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>If you had some mercury, a 5 foot column should do the =
trick.&nbsp; Don't tell the EPD, though.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>On Sun, Apr 7, 2024, 15:37 Benjamin Zwissler &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p =
class=3DMsoNormal>I calibrate my Milton (which has consistently read =
high) to my wife's tpms value.&nbsp; &nbsp;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.&nbsp;<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
don't know how to create an inexpensive standard for calibration.&nbsp; =
&nbsp;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.&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Any ideas on creating a low cost pressure standard for =
calibration?<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Ben&nbsp;<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>On Sun, Apr 7, 2024, 1:49<span =
style=3D'font-family:"Arial",sans-serif'>=E2=80=AF</span>PM Jeff =
Scarbrough &lt;<a href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><p class=3DMsoNormal>So, =
I have three tire gauges:&nbsp; Accutire electronic, Jayco mechanical, =
and Milton Inflator hose with gauge.&nbsp; All three report =
consistently, and&nbsp;all three are 3-4 psi different - low to high in =
the above order.<br><br>Is there a simple way to check =
accuracy?&nbsp;&nbsp;<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>&nbsp; &nbsp; Jeff&nbsp;<o:p></o:p></p><div><p =
class=3DMsoNormal>&nbsp; &nbsp; Corrosion Acres, =
Ga.<o:p></o:p></p></div></div></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br><br><a href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a><br>Donate: <a =
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nage: <a =
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From: Bob Spidell <[email-masked]> NEqzivL0seq7neaDA0ETqvWy5npeDOw39DLLK+cJUpqwvOgJ/Tz3Q9QA9jbPVtID/b57A7iCg8U9onPc5tbXUaL2XTaya4sF8GE=
Date: Fri, 26 Apr 2024 12:04:40 -0700

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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).

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.

On 4/26/2024 10:26 AM, [email-masked] wrote:
>
> Sorry for the late reply – I have no idea where several weeks’ worth 
> of messages have been hanging out!
>
> 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…
>
> *From:*Shop-talk <[email-masked]> *On Behalf Of 
> *Jeff Scarbrough
> *Sent:* Sunday, April 7, 2024 1:13 PM
> *To:* Benjamin Zwissler <[email-masked]>
> *Cc:* [email-masked]
> *Subject:* Re: [Shop-talk] Tire Gauges
>
> 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.
>
>     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.
>
>     On Sun, Apr 7, 2024, 1:49 PM Jeff Scarbrough <[email-masked]>
>     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.
>
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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:[email-masked]">[email-masked]</a> wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:[email-masked]">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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      <div class="WordSection1">
        <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:&quot;Calibri&quot;,sans-serif">-----------------------------------<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">All
            the best,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,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>
        <div
style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
          <p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">
              Shop-talk <a class="moz-txt-link-rfc2396E" href="mailto:[email-masked]">&lt;[email-masked]&gt;</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:[email-masked]">&lt;[email-masked]&gt;</a><br>
              <b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:[email-masked]">[email-masked]</a><br>
              <b>Subject:</b> Re: [Shop-talk] Tire Gauges<o:p></o:p></span></p>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <div>
          <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>
          <div>
            <p class="MsoNormal"><o:p> </o:p></p>
          </div>
          <div>
            <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>
          </div>
          <div>
            <p class="MsoNormal"><o:p> </o:p></p>
          </div>
          <div>
            <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>
          </div>
          <div>
            <p class="MsoNormal"><o:p> </o:p></p>
          </div>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
          <div>
            <div>
              <p class="MsoNormal">On Sun, Apr 7, 2024, 15:37 Benjamin
                Zwissler &lt;<a href="mailto:[email-masked]"
                  moz-do-not-send="true" class="moz-txt-link-freetext">[email-masked]</a>&gt;
                wrote:<o:p></o:p></p>
            </div>
            <blockquote
style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
              <div>
                <div>
                  <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>
                  <div>
                    <p class="MsoNormal"><o:p> </o:p></p>
                  </div>
                  <div>
                    <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>
                  </div>
                  <div>
                    <p class="MsoNormal"><o:p> </o:p></p>
                  </div>
                  <div>
                    <p class="MsoNormal">Any ideas on creating a low
                      cost pressure standard for calibration?<o:p></o:p></p>
                  </div>
                  <div>
                    <p class="MsoNormal"><o:p> </o:p></p>
                  </div>
                  <div>
                    <p class="MsoNormal">Ben <o:p></o:p></p>
                    <div>
                      <p class="MsoNormal"><o:p> </o:p></p>
                    </div>
                    <div>
                      <p class="MsoNormal"><o:p> </o:p></p>
                    </div>
                  </div>
                  <p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
                  <div>
                    <div>
                      <p class="MsoNormal">On Sun, Apr 7, 2024, 1:49<span
style="font-family:&quot;Arial&quot;,sans-serif"> </span>PM Jeff
                        Scarbrough &lt;<a
                          href="mailto:[email-masked]"
                          target="_blank" moz-do-not-send="true"
                          class="moz-txt-link-freetext">[email-masked]</a>&gt;
                        wrote:<o:p></o:p></p>
                    </div>
                    <blockquote
style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
                      <div>
                        <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>
                        <div>
                          <p class="MsoNormal"><o:p> </o:p></p>
                        </div>
                        <div>
                          <p class="MsoNormal">    Jeff <o:p></o:p></p>
                          <br>
                        </div>
                      </div>
                    </blockquote>
                  </div>
                </div>
              </div>
            </blockquote>
          </div>
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[email-masked]

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