Review on TST 507 Tire Monitoring System: 4 Sensor with Color Display - Perfect for Tracking Multiple Trailers by Christopher Gulledge

The TST 507 is rock solid. At first I was worried because I have rubber valve stems (high pressure version) and all the bad reviews about rubber valve stems almost made me not buy them. Glad you did! I've ridden 250 miles round trip (500 miles) and had no issues. Everything worked as expected. I used them on my tandem trailer. I called TST tech support/customer service before I went on the trip and they were very friendly and mentioned that they have these caps in service on thousands of rubber valve stems.