I have an old version of this car tire refill in my garage. But recently I got a second air compressor in my barn for tractors, mowers and other equipment. I have used a standard tire inflator along with an old fashioned analog gauge which is both unreliable and awkward to use. It combines all of these features into one fast, accurate, and easy-to-use tool. The quick coupler and clamp mechanism easily attaches to the valve stem. Hold on. No guesses. It's also a BIG upgrade from the old version I have in the garage. The rubber hose on this device is much stronger and more durable. The clamping mechanism is also much better and more reliable. The trigger feels very solid and releases a lot of air very quickly. The same applies to the outlet valve. This set also included many very useful accessories such as an angle adapter for hard-to-reach valve stems. It also includes 4 metal valve caps, an extension and some other parts. The accuracy of the meter seems to be perfect. I compared it to a digital pressure gauge as well as an older analog pressure gauge. All measurements were very close. I love that the batteries were included so it worked right out of the box. Oddly enough, as you can see from one of the photos, the label inside the battery compartment incorrectly says AA batteries. But it's clearly meant for AAA. All in all this is a great product. Well made with quality materials, should last a long time. Large selection of useful accessories. Reasonable price to download. I hope you found this information useful.