Rpm counter is basically the measuring and testing instrument that suits varied industrial automation, general time and count based applications. Digital and microprocessor based rpm counter that works very fast are available in the market with varied ranges. This counter is available as a stand-alone instrument and as a master instrument. Electronic rpm counter give a reliable, high accurate and easy to read system that is suitable for all type of operations. In case of an aircraft engine, effective use of this measuring meter is done for indicating the revs of the engine number, which provides a secure and fast data transfer. This counter is also available to meet the requirement of dedicated logic control for machine automation. For packaging, printing and for special purpose machines, this counter is suitable for their smooth operation. For speed measurement and for batch counting this industrial instrument is very effective. Almost all the industries apply this measuring equipment for the measurement of the performance of the engine.