UPDATE
Longacre #52003 - 'Deluxe' Analog Tire Gauge

I took the above, plus an older Milton shirt-pocket gauge that I found in my garage
and cleaned all the grime off of, to my local mechanic to cross-check against his
Astro 3018(? looks like one anyway) inflator gauge.

Results:

My Honda calls for 32.0psi cold in its tires.

After driving just under 1mile to my mechanic's:

Astro 3018 showed my right front as 32.5psi 3x.

Longacre #52-52003: Approx. 32.6-7 psi, twice. 0.2psi over Astro.

Milton shirt pocket/pencil: 34.2-3ish, twice. 1.7ish psi over Astro.


So for absolute accuracy, the Longacre 52003 dial-face was worth the $45+ I
invested in it. No need to mentally compensate with that one!


I know that my digital Longacre reads one full pound/sq. inch over the analog
Longacre, so 1.4-psi compensation required.

My digital DIYCO D1 Elite reads about 0.3psi above the analog Longacre, or
about half-psi above the garage Astro. So 1.0psi compensation there. My only
pet peeve with the DIYCO is it takes 3-5sec. to get a reading: 31.9.....32.1...
32.3! Batteries new in both digital gauges.

So:
Longacre #52-52003 Deluxe analog is my home reference, with the DIYCO
in second place.

My Longacre Basic Digital reads quickly, but is 1.4psi higher than the garage's
Astro, but I must remember to compensate.

My old Accu Gauge: about a hair below the Astro 3018, but better to slightly
over than underinflate.

The Milton pocket pencil? EMERGENCY use only, at nearly 2psi over
garage. The index rod slides so easily on it and lots of wiggle, so I suspect
it's really old and probably worn out.

I hope the above reference tests will guide others' future tire pressure gauge
purchasing decisions!