What is the Max RPM that IRD8800 Speed Monitoring Module M88900 can Monitor?

What is the Max RPM that IRD8800 Speed Monitoring Module M88900 can Monitor?

The Max Rotations per Minute (RPM) that IRD8800 Speed Monitoring Module M88900 can Monitor is 99,999 RPM. When units are set to Hertz (Hz) - it corresponds to 1,666 Hz approx