I did fail to mention the origin of this experiment - the aspects for comparison I've listed here represent the summation of the achievable observations I can make for these units, based on discussions with other shooters and requests by shooters to incorporate aspects into the protocol. I was asked the first time to do this comparison on a whim during conversation at a match during the Spring this year when I mentioned to a few new shooters that I found myself owning 4 chronographs, a request which was subsequently repeated when I mentioned in passing with these shooters and a few others that I came to own 5 chronographs after I won a LabRadar LX at an ELR match in the Fall. In crowd sourcing aspects for comparison, I was offered a 6th Chronograph, the Caldwell, to be included in the project, and a shooter from Florida mailed me his unit.

As common talking points, specific advantages of magnetosensor and radar units over optical chronographs, the newer, smaller radars over the older, larger units, and the specific positional (axial displacement and lateral/radial displacement) and angular sensitivities of the new units vs. the old have been questioned ad nauseum by shooters, but I have seen no reports of actual results for any of these units. So those positional sensitivities were in my first draft of a proposed protocol. I was then requested to integrate archery equipment and shotshells, as well as integrating suppressed fire (since the LabRadar V1 users recognized the dependence upon inertial triggers for suppressed fire). I was also asked to experiment with low range velocity as well as "boundary range" velocities, as some users have noted the Xero will exclude shots from a string which defy the specific velocity ranges described in the menu. Needing a means to produce only 100fps or 250fps velocities, I've incorporated BB/Pellet rifles into the mix (which also typically have required inertial triggers for the old LabRadar V1), as I BELIEVE I can throttle speed with my pellet rifles to straddle purposefully above or purposefully below the respective limits of MOST of these units. I honestly have no idea what I can use to pitch a bullet only 20fps across the ProChrono - maybe I'll orient it vertically and drop something off of my roof through the screens?).

So all of these aspects of comparison have been either common topics of concern during conversations leading up to the development of this protocol, OR were specific requests by shooters who have responded to my threads like this one around the web to request aspects of interest to be included in the protocol.

The output, as I currently intend it to be, will be a structured forum post as well as photo and video narratives (likely hosted on youtube, as currently planned) to provide reference for shooters who are considering purchase of any or all of these units.