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If you want accurate, get a good dial gauge and thread a tire chuck to it.
Most if the ones smaller than 2" are junk.
If it has a calibration/zeroing screw it is probably a good one.
It will set you back $20 but I have ones older than me that still checkout with >$100 NIST traceable ones.
When you think about how many $4 Discount Auto ones have died on you, $20-30 doesn't seem so bad........
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