Bently Nevada 3500/50-01-00-01 (P/N 288062-02) is a dual channel tachometer module with internal terminals (backplate 133442-01) designed for the 3500 Mechanical Monitoring System, specifically for critical rotating equipment. It supports proximity probes/magnetic pickups to measure speed, acceleration, and direction, with programmable alarms (overspeed/underspeed, zero speed, reverse rotation) and peak hold function. Durable, anti-interference, seamlessly integrated with the 3500 rack, achieving stable and reliable status monitoring.