The E2062 Precision RPM Counter is a compact module measuring RPM from 0.343 RPM up to 120,000 RPM using inverse period measurement accurate to 1ppm on a backlit display. The number of sensors can be selected from 1 to 32. Programmable alarm thresholds allow abnormal RPM conditions to be detected. A serial output is provided every second and an alarm signal is activated according to the alarm setpoints and mode.