I got this thinking it would be more accurate than the cheap one. It is less! I'm a professional driver and have compared it to my other two cheap gauges as well as a couple of gas station air compressor pumps and my mechanical gauge. Each scale, including the cheap ones, was within two pounds of each other, and this one was up to five pounds (although it can change on back-to-back tests on the same tire!). I had to fiddle with it to keep it from leaking. Do not buy this product.