I went ahead and spent the extra money for a nice tire guage to use on my vehicles. I'm sure this guage is accurate, but it is a real pain in the rear to use. Hit the button to turn it on and it takes about 3 seconds before you can place it on the stem to check the pressure. The reading appears and stays on for way more than long enough to see it. If you have to let some air out of the tire, you will have to shut the thing off and restart it and go through the whole startup process. I guess it is comparable to starting up your computer and waiting for all the startup programs to do their thing before you can get on the net. Mine will be on eBay soon.