Tyre pressure

[dr. d]

Hi folks,

I have a question regarding tire pressure gauge accuracy.

I'm contemplating to buy a tire pressure gauge and I saw one in Blade Auto Center, its brand is OMP with accuracy of +/-1.
What does +/-1 accuracy mean? Is that accuracy good?

Many Thanks.

it means that the real value is somewhere within -1 to +1 unit (psi?) of the reading displayed on the gauge.
that is, assuming the gadget is truly accurate, out of the box.
but that's another question, altogether..