On 17 Dec 2004 17:18:02 -0800, "AC" <pcfnet@yahoo.com> wrote:

>Dear all newsgroup reader,
>
>I am trying to do a survey on driver's willingness of purchasing a
>Digital Tire Pressure Gauge, to ensure driving safety.
>
>Please reply group by simply saying "YES" or "NO". Or if you want you
>can also reply group with your comments on this issue.
>Thank you for your corporation.
>
>AC

Isn't the survey pretty much "in"? They sell digital tire gauges all
the time in stores all over the country and have been for many years.
--
Elbridge Gerry, of Massachusetts:

"What, sir, is the use of militia? It is to prevent the
establishment of a standing army, the bane of liberty. . .
Whenever Government means to invade the rights and liberties of
the people, they always attempt to destroy the militia, in order
to raise a standing army upon its ruins." -- Debate, U.S. House
of Representatives, August 17, 1789

On Fri, 17 Dec 2004 22:59:46 -0700, AZGuy <SPAMOUT@cox.net> wrote:

||On 17 Dec 2004 17:18:02 -0800, "AC" <pcfnet@yahoo.com> wrote:
||
||>Dear all newsgroup reader,
||>
||>I am trying to do a survey on driver's willingness of purchasing a
||>Digital Tire Pressure Gauge, to ensure driving safety.
||>
||>Please reply group by simply saying "YES" or "NO". Or if you want you
||>can also reply group with your comments on this issue.
||>Thank you for your corporation.
||>
||>AC
||
||Isn't the survey pretty much "in"? They sell digital tire gauges all
||the time in stores all over the country and have been for many years.

I'll bite on this.

I race a sports car in SCCA road racing. Exact tire pressures are pretty
important to us, so we pay for pretty good gauges. Even those will vary from
brand to brand. I can check a tire with my gauge, and then borrow gauges from
the people pitted next to me for comparison. We do that alot, in conjunction
with the"What pressure are you running?" discussions.
My analog racing gauge is dead on with those of at least two of the
front-runners in our group. Both are very careful to buy good tools and take
care of them. Lacking a way to check calibration, I think my analog gauge is
very accurate.
I have about 5 digital gauges, none of them cost over $10. Every single one
reads exactly the same on the same tire. All are within .5 lbs of my analog
guage, which is the limit of their resolution and the reason I don't use them
for racing. If I find one with a 0.1 lb resolution, I will buy it.
I read a while back that every brand of digital tire gauge on the market uses
the same transducer. The only differences are the case and fittings around it.
That fits with my simple tests.
So I do use them with confidence on all my street vehicles, but I'm still
analog for the track.
Oh, and those pencil gauges are crap.

So, does anyone know a way to check the accuracy of a tire gauge against a
standard?

Texas Parts Guy

<rex@txol.net> wrote in message news:41c72eea.20950788@news2.txol.net...
> On Fri, 17 Dec 2004 22:59:46 -0700, AZGuy <SPAMOUT@cox.net> wrote:

> Oh, and those pencil gauges are crap.
>
> So, does anyone know a way to check the accuracy of a tire gauge against a
> standard?
>

Sure. And since your a racing nut you probably would love this. Just drill
a second
tire stem hole in one of your rims that is opposite the main stem. Told you
you would
love it - as the second stem now balances the rim. ;-) Now you can hook a
super-accurate
guage to one stem and the guage to be calibrated to the other. Bleed down
the air
in small increments and check the pressures.

Ted

"rex@txol.net" wrote:

> So, does anyone know a way to check the accuracy of a tire gauge against a
> standard?

What I have seen in a lab is a deadweight pressure tester.
It is sort of like a piston in a cylinder with a platform
you can add weight to. The piston is a known area. You add
the weight and generate a know pressure in the cylinder. It
looks to me that most of the "portable" tester promise 0.1%
to 0.25% accuracy depending on how much you are willing to
spend.

See:

http://www.ipfonline.com/storefront/ravika/Product402.htm
http://www.hotektech.com/Sicompany.htm

Regards,

Ed White