It is like clips vs. magazines...
The device you looking for is called chronograph. "Shooting Chrony" is a trademark of Canadian company manufacturing chronographs, but there are other manufacturers.
BTW, you should have paid more attention when you ammo been chronographed at Level III matches...
Still not sure why you don't understand, that I'm choosing to use the term "Chrony" to generalize all chronographs. I'm sure you're the only one who doesn't get me.
By the way, will all Chronys work if I throw "Kraft Dinner" thru them
I'd like to support local company, but want the product that's better, if one is better for reliability and better record for reading correctly... Now how someone knows if their chrony is reading correctly, I don't know... I'm guessing folks who owned more than one brand/model thru-out the years can better answer, or folks, like Kent, who've been Chrony guy at level 3 matches, can better answer from experience with various models.
I appreciate all feedback up to now.
I look forward to more replies from folks with multi model experience as well.