Item arrived on time and in good condition. The instructions were easy to read and understand. I particularly liked that this device is built to prevent air escaping when in use and that it has a backlight to help you locate the filling tube in the dark. I would have preferred you pressed the power button to turn it on and off rather than toggling between different modes. I would also appreciate it more if there was a way to reset the device between its use on each bus. At times I was a little unsure if the next tire was showing the same pressure as the first, or if I was using it incorrectly and it slowed things down a little while waiting for him to switch between each tire. I'm used to this little quirk, so it's not that bad. I have used it on both air filled and nitrogen filled tires and it has worked on both. I used it to measure tire pressure about 80 times and it was only wrong once (18 instead of 31.5). When the time came, I just took it off the tire and put it back in. I compared it to another analog tire gauge and the numbers are close enough that I'm not worried about its accuracy. They couldn't be accurate as I was comparing a digital meter to an analog meter and I can't get half a pound feedback from an analog meter. I would recommend this sensor.