Digital RPM Meter
RPM meter, is an instrument that indicates the speed. The most common form of the rpm meteris one that measures the speed of a rotating shaft, as in an engine or other machine. Theycommonly calculate speed based on how fast an engine shaft is rotating. This information isgiven in revolutions per minute. A micro-processor calculates RPM from the time period betweenpulses. Existing rpm meter can give us the rpm value, but with more rpm resolution.