Microwave Frequency Counter with Self Checking Facility uses microwave sampling and harmonic frequency mixing procedure to measure the microwave frequency. The Microwave Frequency Counter is provided with self checking facility. The Microwave Frequency Counter is equipped with built-in one-chip microcomputer that performs function control, time sequence control, data processing and the result displaying of the whole measurement process. Microwave Frequency Counter with Self Checking Facility is featured with 11 digit dual line liquid crystal display.