For example: Agilent E4440A or Anritsu 68369
300 MHz Rubidium Frequency Counter/Calibrator
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Fluke PM 6681R Overview
The PM 6681R sets the new standard for measurement and analysis of time intervals, frequency, phase and jitter. For development, calibration, or challenging production test applications, the PM 6681R is the leader.
Fluke PM 6681R Performance Characteristics: