> What is the best device for measuring a reference signal (i.e. 10 MHz)
> to verify it's accuracy?
The best is a frequency counter with an external cesium beam
frequency standard for a reference. Make sure that you're wearing a
seat belt when you check the prices.
On the other hand, you can do fairly well with any decent counter
with a good internal timebase.
Service to my country? Been there, Done that, and I've got my DD214 to
Member of DAV #85.
Michael A. Terrell