Kleen Wheels 44444 Tire Pressure Gauge, (Set of 4)

I have runflat tires, so you do not know if they have air in them unless you have the car manufacturer's tire pressure monitoring system. I do, but I bought snow tires and mounted them on another set of wheels. So when I replace my normal tires with snow tires I lose the tire pressure monitoring. While I enjoy the added security of real snow tires in winter, I've always worried that a tire would go flat and no one would notice. You can drive on flat runflats up to a certain speed for a certain number of miles but if you don't know they are flat and drive normally indefinitely they will disintegrate on you.These fit the bill perfectly. I had a different brand and they seemed to be damaged easily and cause slow leaks. These went through a full winter without damage or loss of air pressure.Since you cannot see these caps while driving, you have no idea if you lost pressure since last starting out. Most tires go flat by slow leaks over time, so if you look at each cap before setting out you are protected from the vast majority of flats. If you do not have runflats, of course you will know if you get a flat right away, but short of that these will tell you if you are low, which is bad for gas millage and tire wear.Runflats or not, these caps were by far better than the others I tried. No leaks for a full winter.

----------- the green, at a glance, shows that yer tires are properly inflated . any redness and you should re-check the pressure . . .cheap and simple. just the way it should be. the only star missing is being able to tell whether the pressure is 32 or 34 or 36. it's green because you screwed it on when the tire pressure was properly set. oh well. cheap and simple . . .

I was a little skeptical about these from some of the other reviews that stated these valves were fragile.You know what, they work great! They have been on my car thru rain, snow, and ice and so do not appear fragile at all. It is somewhat reassuring to know that when my low tire indicator "idiot light" lights up on my dash I can merely have a look at my fancy valve stem caps and know which tire is low.Great product that certainly saves me time guessing which tire is low, which tire is getting low, and which tire to fill.These are much more practical than the little dice valve stem caps I had on a custom van years ago...hopefully, these won't get stolen like those did.

Aired my motorcycle tires up to the specified 42 psi and put these on. After 2 weeks of sitting these still showed all green, now I know that if my bike sits even one week I have to put a couple of pounds in the tires so I checked them. The two 42 psi tires were down 6 pounds each, that's 1/7th or 14.3 percent. I removed them.UPDATE;2-22-14 I also put these on my car and eventually my TPMS came up showing low tires. I had to air up all my tires, yet these still showed all green. Again, I removed them and put the regular caps back on.

Caps are very small and hard to read, don't seem to be made of very durable material. We'll see how they last.

Screwed on tight with no leaks. Seems to be doing what it's supposed to do.

I've had the valve stem caps installed for a week on my motorcycle and they work just as advertised...love them.

does not work