The straight chuck is Presta, the 90 degree chuck is Schrader. Just be sure not to lose the chuck that's not being used. To swap between Presta and Schrader chucks, unscrew the chuck that's on the gauge and screw the other one on. The way the valve chucks are designed, it's easy to get a good connection without letting a bunch of air out. You don't need to screw the valve chuck onto the stem, just press it on. This tire pressure gauge is easy to use and accurate. I will also contact JACO with suggestions about how to improve the design, because right now it sucks. I will return the tire gauge, as it doesn't fit my standards. Lastly, there is no bag to carry the adapter that's not currently attached to the gauge very easy to lose the unattached adapter. unscrewing the front part will expose the silicone seal) would help. Granted, you don't need to be a rocket scientist to figure out how to use the adapters, however, there are people that are more mechanically-challenged, and a more detailed description (e.g. No instructions about the assembly/disassembly of the adapters. what recommendations? I flipped the sheet over to read more - the back is blank. It reads "Please use per our recommendations:" Aaaaa. A precise tire gauge is marked in increments of 1 psi - that's what professional mechanics use. It's an OK precision, but it doesn't make it a precise tool. I found out it isn't a slip - it's for real.) (Incidentally, if you look at the item's images on Amazon, you will see the same fault, however, I thought it was just a picture-taking slip. The psi values are hidden behind the dial bevel, and you have to bend the gauge at an angle in order to see what you are measuring. The dial is not that easy to read (see 1st image). That wasted brass makes up for the massive weight of the valve. The valve thickness could easily handle 3,000 psi, which is ridiculous given that the gauge can go to only 60 psi. There is a lot of useless brass surrounding the silicone seal (see the 3rd image). The adapters, both Presta and Schrader are HUGE! In the second and third image, this adapter is compared with two different Presta adapters that I use for tire inflation. It has its pros, of course: it is sturdy, has glowing-in-the-dark dial, two units of pressure (psi and bar), protective rubber frame, comes with the Presta adapter. Unlike other JACO products I own, this model disappointed. In all, a great gauge, but a carrying case would make it near perfect. I haven't checked accuracy with multiple other gauges, but I am prone to assume this is the most accurate. Once I figured out where to put the silicone tube, things worked great. a spare silicone tube would be nice, now that I know it's a seal that rubs on the presta threads and may eventually wear. It would be nice to be able to at least clip it to the hose, or better yet, provide a carrying case with a spot for the unused nozzle If I store it somewhere safe, I'll never have it with me. I am sure to lose whichever one I'm not using. Again, what should I do with this silicone tube? By dumb luck and trial-and-error, I finally figured out it was the presta stem seal The liner was loose in the schrader attachment tube? Without a diagram or instructions, it made no sense what it was or what to do with it. The presta nozzle did not have the silicone liner installed. I like that it retains the reading until you choose to clear it. I love the bleed-off feature to dial in the pressure. Solid brass nozzles and fittings, real rubber hose, beautiful dial. The gauge is built like things used to be.
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