TST CAP System is the best Tire Pressure Monitoring System (TPMS) on the market, and the only one that includes a color monitor. The cap sensor is very popular for those that are looking for a low-profile sensor. The Cap Sensor can be used with metal or rubber valve stems. This product is made from high-grade materials to meet the strictest standards of high quality. Designed with the utmost care and attention to detail, this product ensures superior reliability. It provides long lasting and trouble-free service life.