Tire Deflators Offroad Accessories, 4PCS Air Down Tire Deflators, Adjustable 10-30 Psi Auto-Stop Screw-On Tyre Deflator Tool for Trucks, Offroad 4x4, SUV, RV

If I could do 3.5 stars thats where I would be at on these as they do work but there is a little room for improvement. I was pretty excited to get a set of these to save time when airing down to go wheeling in my jeep. I had a 35x12.50 in the shop so I decided to test each one out individually before taking them on the trail. I will say each one was very consistent within 1-1.5 psi over 3 test runs on each individual piece. The problem was the extreme spread of 8 psi between the 4 units. Now being they are pretty consistent individually i will probably pick the most accurate one of the 4 and then individually mark each one +3 or -2 whatever each one tends to settle at. This may change over time as anything that is spring regulated but it will get them a little closer as a group for the time being. Obviously I intend to set them 3-4 psi over my intended pressure then manually fine tune each tire. Not a huge issue but definitely not as accurate as i would prefer. Second issue I came across is the lengthbof threads on the adjustment screw. If you are airing down to 10psi there is only 1-1.5 threads holding it in. I would assume over time it will probably strip and no longer be able to go down to 10. An additional 1/16 or 1/8 of threads would sure be nice. Last and final issue was one of the pices had some poorly tapped threads and required some lubrication and some working it in and out to smoothbthe threads off. I thought about getting the taps out but decided it probably wasn't worth the effort and just smoothed them out with some repetitive threading in and out. Seems to have done the trick for now. All in all these aren't horrible and not fantastic. Pretty decent price (I received them through vine). They do work but not without some hiccups. If your looking for super accurate tool that you dont need to double check id keep looking. If your ok with getting close then manually adjusting or you dont care that much and are on a budget then they are a lot better and faster still than individually airing down each tire and that means more time on the trail and less at the trailhead so thats a win in my book. Oh and they do include 5 black valve stem caps and a little bag to keep them in so thats a nice touch.