The Time Interval and Frequency Counter is an essential component in some labs. This tool will measure pulse width, frequency, rise and fall time, events and phase.
This instrument is used to compare clocks to each other and you can tell which clock is the best, most stable and most noisy. You can compare different quartz clock crystals to each other to find out which is the most accurate.
Read more about these devices here.
Next lets move on to the celebrity of test equipment: the oscilloscope!