This product outputs a single NPN alarm signal channel. The output can drive an indicator light for warning purposes. It is compatible with Hall switches, metal proximity switches, infrared proximity switches, and other detection switch signals, enabling flexible integration with existing sensors. Features include a multifunction speed measuring and counting meter with speed measurement, counting, and an upperlimit alarm output function, all in one device. Performance and installation: reliable operation, simple installation, and a wide application range. It is suitable for various mechanical equipment where rotational speed measurement and production counting are required. Typical applications: harvesters, machine tools, motors, and fans, or any system needing rotational speed monitoring and counting for process control or traceability. Use scenarios: On harvesters to monitor rotor or reel speed and track production activity, with alarms when speeds exceed set limits. In machine tools to measure spindle RPM, count produced parts, and trigger upperlimit warnings when thresholds are reached. In motor or fan assemblies to monitor speed, support maintenance planning, and record production counts for throughput analysis.