This speed sensor monitors the rotational rate of a shaft or wheel within the sprayer’s metering or drive system. It sends a pulsed signal to the control unit, which uses the data to regulate application rate or ground-speed synchronization. A failed sensor results in erratic spray output or a fault code that halts the metering process. As an original component from the manufacturer, its electrical characteristics and mounting geometry match the housing and connector of the assembly it replaces, ensuring the signal is interpreted correctly by the controller.