This gauge is accurate enough to use for MX Racing. But not if you are trying to alter pressure for poor track conditions.
For the average guy /gal, it a good product, at a good price and good quality.
Works way better than the stock one that comes with ATVs. The hold button is very helpful, when getting inside rims. Also the top swivels so it makes it even easier. Has held up pretty good so far to abuse.