Frequency counters are digital indicating meters for accurate measurement and display of square wave and pulse input signals. There are several types of frequency counters which differ in frequency ranges and the number of digits that can be displayed. A digital counter represents the count in digital form. A frequency counter is an electronic instrument used to measure frequency and time. Digital counters are the integrated circuits which are used to count the events in the digital systems or computers. Digital frequency meters display the accurate frequencies that are generated by the signal generators. Frequency counter kits are the circuits that are mounted on a printed circuit board (PCB). Frequency counter kits are used in digital dabbling, transmitter and receiver circuits. Meter counters can count up and down and can also store data with a powerless non- volatile data backup. Pulse counters are used to count people entering a particular place, or can be used for time measurement. Frequency counters are used for wide range of frequency and time measurements and display 10 to 12 digits accuracy frequency measurement.