So shot my first chronograph today after using one for the past 25 years. Was a standard shooting chrony and made myself a button to show SD, ED, AVG, Shot #. Guess it is time to upgrade to one that has the sensors separate from the computer. I have a magnetospeed but couldn't use it as I was tuning an adjustable gas block and had the handgaurd off, plus it doesn't work for handguns.