Thank you for the info. I am OK with being off by 5-10 fps. Unless I am selling and fail to disclose what chrony I used to measure etc.
I did not know you can spend upwards of $700 on a chrony, however, as you describe it that is one fine machine.
I do appreciate the time to write that info up. Will continue to consider and ponder. Not in a huge hurry, my wife has asked me what I want for christamas and this sounds like a good idea!