yup I agree.. I've got this same Ryobi inflator, never knew you could zero out the reading! Thanks @MyWifesBoyfriend for the tip about zero-ing out the reading! And it is true that over time the older Ryobi (had the handle trigger) did get tired and I stopped using it. The newer one is more powerful. Using a 4AH HP battery is much quicker than the 2AH it came with in the kit.
Back to the inflator's performance, I've found that it gives a reading then while it's pumping air it jumps up like 2-3 psi on the reading. What I usually do is take my accurate Jaco gauge, see how many pounds of air it needs and watch (after the Ryobi stablizes) and count that many pounds of air. In a perfect world, I could rely on the Ryobi alone but why care? It pumps air in and quickly, I'll do the final adjustment with the accurate Jaco.
Still like the Ryobi.. already had the batteries, so cheap to add to my Ryobi collection..and $25! Easy decision.
