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I found that when bumped around a lot (dropping it, rattling in the trunk of a car, etc) may make it read erratically. I have 3 gauges. A pencil type, a small digital and a round one with a flexible hose. All kept in my garage. They all read within 2psi of each other. I also have a pencil type that I wedge between the seats of my car (for insulation). That one is also with 2psi of the others.
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