It looked like a good unit when I ordered it. As soon as it arrived I went to program the high and low pressure alarms. I've found that gauges are only good for 0-87 psi. My trailer tires are 80psi, so 87 is a little closer to me. A bigger problem was that the low pressure warning had a range of 22-45 psi. For 80psi tires I would like to know when the tires will reach 70psi so I can troubleshoot the issue. If I don't get a warning by the time the tire drops to 45 I could seriously injure myself before I know it. Not recommended for high pressure tires.