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Keysight 53230A Frequency Counter - $3,495
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Includes Option 400 GPIB Interface
Ethernet networking & USB connections
Up to 12 digits a second of precision!
Basically the highest end stopwatch in the world. Can tell time between two signals to a resolution of 20 picoseconds!
I bought this for working with a rubidium atomic clock & GPSDO oscillator a few years ago and I no longer need it for this project.
A very nice unit with large color screen and tons of options quickly accessible through the onscreen softkey menus and dedicated buttons.
Nerd fun:
If you plug the 10 Mhz output of one atomic frequency standard (AKA an atomic clock) into the "Ext Ref In" port in the back, and then a second atomic clock's 10 MHz output into the front input, this will actually display how much the two atomic clocks diverge by! This thing is *that* precise and why I bought it. It literally tells you how far off two atomic clocks are.