RT61 RT61 Tire Pressure Monitoring System (TPMS) ModelFor Commercial Vehicle Product NameTire Pressure Monitoring System (TPMS) Operating Frequency433 MHz Operating Temperature-30° C ~ 105° C Monitored Pressure Range0 psi ~ 203 psi ± 1.5 psi Monitored Temperature Range-40° C ~ 125° C ± 3° C