The OMRON K3HB-CNB-CPAC21-AC100-240 is a high-performance pulse meter designed for industrial automation applications requiring precise up/down counting and pulse measurement. This versatile device supports NPN input and voltage pulse input, offering a sensor power supply of 12 VDC. It features a user-friendly two-color display for easy recognition of operational status, switching between red and green. With a high-speed measurement capability of up to 50 kHz, it is ideal for monitoring and controlling processes involving rotary encoders or ON/OFF pulse signals. The K3HB-CNB-CPAC21 also includes relay outputs for enhanced control, making it a reliable choice for integration, addition, and subtraction pulse metering tasks.