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Old 05-16-2017, 03:20 PM   #1 (permalink)
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Looking for a new tire pressure gauge

So, I've had a few different tire pressure gauges. The digital ones are nice because they give you exact numbers (not that its THAT important). Mechanical ones are nice because they don't need batteries. I think I'm leaning towards a mechanical one, but I'd also like something accurate that lasts. So, I'm looking for suggestions. What do you guys like and why? Thanks!

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Old 05-16-2017, 05:13 PM   #2 (permalink)
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I have a digital one that I keep in the garage for when I'm at home and checking pressure (usually when I'm changing tires). I keep a mechanical "stick" type for emergencies in the glovebox. At higher pressures I'm not sure the stick types can be really relied on for much accuracy - but that's just my guess.
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Old 05-16-2017, 05:13 PM   #3 (permalink)
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I have a tire slime gauge it's pretty accurate. It reads 1psi high across pretty much the entire span.
I don't know how accurate the digital ones are.
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Old 05-16-2017, 05:25 PM   #4 (permalink)
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I use an dial Accu-Gage.
The mechanical accuracy rating is ± 2% from 30% to 60% of scale. If you are interested in more info go here https://www.ghmeiser.com/index.htm
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Old 05-16-2017, 09:54 PM   #5 (permalink)
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My job deals directly with accurate temperature and pressure measurement. I think what you're after is repeatability and not accuracy. It doesn't matter that your tire is exactly 40.000 psig, it is more important that the tires are approximately the same pressure.

The transducers we use in high volume are around $1000 and error is +/- 0.4% of full scale, we buy 0-30, 0-100, and 0-600. The transducers we use for critical places are about $1500 and are +/- 0.05% of full scale and are 0-2300 psig.

I'll drive the point home, ignore accuracy and go for repeatability in this case.

Also, the reason they are so expensive is because they are high quality electronic transducers. So how good is that $5 digital tire guage?

+/- 2% of full scale on a gauge that goes up to 100 psig would be 2psig. So instead of 40 it could be anywhere from 38 to 42 with no way for you to know.
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Old 05-17-2017, 07:27 AM   #6 (permalink)
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Quote:
Originally Posted by ksa8907 View Post
+/- 2% of full scale on a gauge that goes up to 100 psig would be 2psig. So instead of 40 it could be anywhere from 38 to 42 with no way for you to know.
So if the gauge is 60 PSI then the 2% is 1.2 PSI from 18 to 36 PSI (30 to 60 percent of scale). Would have thought the the percentage would have been of the actual reading not of the gauge limit.
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Old 05-17-2017, 07:30 AM   #7 (permalink)
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I just plug in my tire pump now and then, it has a gauge on it. If the tire is below my threshold, I turn it on and add air.
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Old 05-17-2017, 01:12 PM   #8 (permalink)
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I wasn't happy with the gauge I bought. And I wasn't happy with the other cheap gauges available. So I made my own! I used the quick-connects so I could swap tire chucks with my compressor if I needed to.
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Old 05-17-2017, 02:58 PM   #9 (permalink)
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Quote:
Originally Posted by nemo View Post
So if the gauge is 60 PSI then the 2% is 1.2 PSI from 18 to 36 PSI (30 to 60 percent of scale). Would have thought the the percentage would have been of the actual reading not of the gauge limit.
If it were, then if you were reading 1psig your error would be 0.02psig. Not realistic.
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Old 05-18-2017, 01:58 AM   #10 (permalink)
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I've found <$10 mechanical gauges are typically inaccurate, or become so in short order. <$15 electronic gauges are typically very accurate but have awful durability. Nicer mechanical gauges may last a lifetime for personal use, but remain consistent <5yrs used professionally. I've had a https://www.matcotools.com/catalog/p...RESSURE-GAUGE/ for about 10yrs, and it still agrees with most tpms within 1psi and is perfectly consistent retesting the same tire, batteries last a lot longer than I expected ~3yrs.

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