RedRock® RR132 TMR Magnetic Switch Sensors Coto Technology RedRock® RR132 TMR Magnetic Switch Sensors are digital TMR low power magnetic switch sensors ideally suited to the demands of next generation security, metering, medical, automotive, instrumentation, industrial markets, and any application requiring a magnet and sensor. TMR sensors are a popular alternative to Hall Effect sensors and Reed switches due to their ultra-low power (especially important in battery-powered applications), high sensitivity, miniature size, robustness, and availability.