This is the way it works folks:
In a civil proceeding, or a non-criminal traffic proceeding, even a lay witness can give his opinion about speed. It is up to the Judge or Jury to weigh the testimony with all other facts. A cop can absolutely say somebody was going way over the speed limit based on judgment. A cop probably cannot say somebody was going 65 as opposed to 60 without a measurement device that has been properly calibrated.
In a Criminal matter where the burden is beyond a reasonable doubt, it will be harder for a cop to prove somebody speeding, unless again the speed was so excessive as to be well above the posted speed limit.
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