Garmin has their new chronograph up for sale on their website. Look interesting, in particular, it doesn't require anything being "triggered" to capture velocities.
https://www.garmin.com/en-US/p/771164
Applied Ballistics has a review up, but it's behind their paywall, so I can't re-post that here.
https://www.garmin.com/en-US/p/771164
Applied Ballistics has a review up, but it's behind their paywall, so I can't re-post that here.