Count the number of complete cycles in a given time interval
Use the formula frequency = number of cycles ÷ time
Measure the time period of one cycle and use frequency = 1 ÷ time period
Use a frequency counter for direct electronic measurement
Use an oscilloscope to measure the waveform period and calculate frequency
Use a tachometer for rotational frequency
Use a spectrum analyzer for signal frequency components
Use a stroboscope for periodic motion frequency
Use a tuning fork or reference oscillator for comparison
Use a stopwatch and repeated events for manual timing measurements