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Azur Electronics
Measuring frequency is a fundamental requirement which becomes more difficult the higher the frequency or the more complex the waveform. Frequency is measured in Hz, kHz, MHz & GHz.
HP Application Notes: 200 Fundamentals of Electronic Counters; 200-1 Fundamentals of Microwave Electronic Counters; 200-2 Fundamentals of Quartz Oscillators; 200-3 Fundamentals of Time Interval Measurements; and 200-4 Understanding Frequency Counter Specifications, provide useful reference information.
Frequency Counters can often make time and ratio measurements as well.
I have a variety of test equipment available for frequencies up to 24GHz.