Moving Radar is not approved for use in PA, PA never adopted this method since it is too unreliable as a method, to many things could interfere with getting a valid reading.
Second there is no hand held unit made today they operated in moving mode.
Last PA change the rule on calibration for Radar, it only has to be calibrated once every year not every 60 days.
Since it was a PSP who caught you, I highly doubt he would show up in court and stay he pulled up behind you and used a hand held unit on you. If you can get him to say this in front of the judge you could easily win this by asking the offer to prove to the court that his hand held unit is approved by PA while moving, which he can not since it is not approved.
Also, the officer is required to write in the ticket the exact model used since PA only approved various model for use, without that information on the ticket you can request the ticket to be dismissed since there is no way to prove after the fact he use an approved device which must show up on the bulletin. The officer is required to bring the bulletin to court to prove the device he used to measure your speed was approved. He is also required to bring the originally calibrated cert as well no copies allowed