The Magnetospeed units are to me the easiest to use, no stands ,ect to take with you, just strap on the BBl. and go.Magnetospeed has saved me more money doing load development. It captures every shot and does not use light. I wasted a ton of ammo trying to get the master beta to pick up a shot. I always read about single digit SDs but could never produce them with the master beta. Turns out it was my chrono not my reloads. https://www.midwayusa.com/product/1016429780?pid=896627
I believe I experienced this anomaly shooting this weekend using one. Rocking along with a ES of 12 and a SD of 4.6 on one group.Every 25 shots or so I get a random speed from my labradar.