Frequency Counter Design

I am puzzled by how Contract Research Organizations can be used to make a counter, too. Maybe you mean Capacitor Resistor Oscillator, but that's not digital. Your use of undefined acronyms makes your question FUBAR.

You could amplify the signal, then clip it to give a square wave, this gould be put onto the input of a fast microcontroller and used as an interrupt, or just dumbly scanned and counted as the state changes (assuming the micro can scan quick enough). A bit of scaling and display the output on a scandard LCD 16 char x 1 Line display...dunno where the CRO comes in.
If you have a cro why do you need a counter...? assuming that by CRO you mean oscilloscope?
I dunno, where did I come in?
Del