We bought two of these. When we first set them up we were very disappointed as it seemed that while the boards were fully inflated it was impossible to tell the PSI because the gauges didn’t move at all, we thought they were faulty.We later found out from an experienced paddle boarder that our boards weren’t inflated hardly at all and when we did continue to pump even though we thought they were full the gauges did eventually move and work just fine.So if you’re new to paddle boarding and you try these keep pumping until it is extremely hard to do so and you should see the gauge working properly so you can get it to the right pressure.I originally gave these one star because of what I thought were faulty gauges. Now that we have a clue so far these seem to be great for the money we spent and we are very happy.Hope this helps someone else, this is information I would have liked to have our first time out. Also, if they aren’t inflated properly they are difficult to navigate, even though they appear completely full.