What TPMS?

I used to sell and still use the TST systems. They are able to monitor tire pressures and tire temperatures and show those readings on a small monitor in the truck or cab. The monitor has a battery in it so you don't even have to have it plugged in to a power source for it to work. You can purchase systems with any given amount of senders that screw onto the valve stems and a new system they now carry that actually goes into the tire(you must break the tire down to install). They have two systems, 1 you can replace the small batteries in the senders yourself,2. you need to send the senders in for exchange for new batteries. The replaceable batteries seem to last about 9 months to a year, the non replaceable last about 4-5 years. You can set the tire pressures that are right for your specific tires, giving a high and low range and if the pressure fall in or out of those setting an alarm will sound showing exactly what tire is the issue. It also shows heat of the tires so should a tire get too hot the alarm will sound. The system is preset to 157 degrees but it can be adjusted up or down to suit your specific needs. I'm only doing this information as some of the new folks( and some of the older folks) either don't know about TPMS or how they operate. Tire failures can occur when the pressures fall below the needed amount to safely carry the load. With a TPMS you can sit in the truck and know what those tires are doing. Hope this answered some questions, and no I don't sell them anymore. I have stopped traveling full time.