tire pressure guage

[Nick Lawrence]

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I would like some recommendations on an accurate tire guage.
Has anyone devised a method of checkng accuracy?
I have used what I believed to be a quality dial type guage for awhile but comparing it to another of the same manufacturer there is a wide difference, maybe 8 psi.
Just got a digital from Sears, it differs by 12 psi.
Would the guage on a welding outfit be accurate in the 30-40 psi range?
Input will be appreciated.
Nick
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