Here's how to verify the clock frequency on your Pro Mini

[NeverDie]

I received some 8Mhz Pro Mini's, and I wanted to verify that they are indeed 8Mhz.

Here's a test procedure that worked for me using an oscilliscope:

1. Connect ground of test Probe to ground of Pro Mini
2. Power up the Pro Mini
3. Touch test probe to PB6 or PB7 of the mcu:
   
   and you will get this, which verifies the frequency:
   
   For some reason I was expecting a square wave, so I compared it to a 16Mhz Pro Mini from a different vendor:
   
   and that one wasn't a square wave either, as you can see.

Regardless, I wanted to test frequency, and this worked for doing that.