I have on hand a CE ProChrono Digital, MagnetoSpeed V3, LabRadar V1, LabRadar LX, MacDonald TwoBox, Caldwell VelociRadar, Garmin Xero C1, and Athlon Velocity Pro (and will have 2 Athlons soon to be able to validate within the same brand, will borrow another Garmin, and possibly another LX). I'm...