Tire Pressure Monitoring Valve Caps Sensor Gauge - Advanced Detection System, 40 PSI Sensing Air Alert Indicator for Cars, Trailers, Bikes - Chrome-Plated, Pack of 4

I have been using these pressure monitors on my car for over 3 months now, and I am amazed at how well they work! As these are rated for 40 psi, I keep the tires inflated to 43 psi and now I can check pressure on each tire simply by looking for a green indicator. Excellent. Few things I noted... After hand tightening a monitor to the valve stem of each tire, you really must drive your vehicle for like 10 miles first in order to "prime" them before you'll get an accurate reading. So, keep this in mind should you ever need to remove the monitors for any reason, like when it's time to change your tires. After a monitor has been showing all green for a while, if ever it begins to show just a little red, then that is an indication to check the tire's pressure immediately using a good quality pressure gauge. To save the most gas (in this case by reducing friction with the road) you'll want to inflate most tires as close as possible to "max press" (maximum pressure) rating stamped on the sidewall. I had a buddy in college who was a real cheapo and always kept his tires inflated to max press with nothing bad happening. But that still makes me nervous, so I try to stay 5 psi under the maximum rated pressure. Chris

First, I agree with other reviewers that these are long monitors so they will, in most cases, protrude from tire but that has not been a problem for me. The monitors are of high quality and have worked extremely well for me. A short walk around each vehicle and I know whether or not my tire pressures are good. I have had 2 small leaks on tires on my Ram 1500. In both cases, the monitors showed lost pressure. I would fill the tires and after a couple of days the monitor showed lost pressure. Had the tires repaired and no problems. These are assembled in the USA.

These are very accurate and a quick check for a wife (a very smart woman) that wouldn't know a PSI from an MRI. Very good looking, they do stick out a little, but for the convenience, they are worth every penny! She can just circle the vehicle and do a tire check and know that the tires are at proper pressure (or close to it). They are fabulous! Bought them again - January, 2016, for another vehicle. Still good to go!

DO NOT BUY THIS PRODUCT! The plastic see-through indicator area broke within 24 hours of installing on my motorcycle tires and caused my tire to immediately go flat at 60 mph while going down a hill in the middle of nowhere in the Arizona desert. My girlfriend and I are very fortunate we did not lose control of the motorcycle and end up dead. THIS PRODUCT MUST BE RECALLED as it is not suitable for its intended use. I am currently pursuing a refund for the $234.40 replacement of the rear motorcycle tire that was damaged during the incident. I'll update this review to let you know how they handle the refund. UPDATE: The company did nothing even refund me for the cost of the valve caps! Terrible…. Buyer Beware!

I've checked them several times - and they are accurate and make my life easier by checking the tires with just a glance. I won't be without them. These stainless steel ones are the way to go - don't go with the plastic ones - sometimes in very hot weather they can get very stuck (melt) on the stem.

Difficult to see the green color and a bit long for bike. The top clipped my rotor

I recommend this product. Good quality and seem to work good. I have 44 psi tires on my Chevy Avalanche and it's nice to only have to walk around and look for the green color to know my tires are properly inflated. My only concern is their length and possibility of hitting them on a curb or something. So far no problems. Looking to get some for my Mercedes!

Great so far on my commuter car. Good price

Frágiles. Se rompen fácil. Y al dañarse tienen fuga de aire. Haciendo que se desinfle la llanta totalmente