Generally within 1-2 fps. Sometime same.
The left two are for pistol, the right two are for PCC.
I don’t know why but someone else set this up.
At times when all three are active I have the same reading on all three. Way cool.
Plywood and a tripod swivel mount.
Tested 3 rounds per gun 242 guns over three days. May have missed 3-4 shots mostly because I was not in position.
Six inches off to the side of the unit. We have 12 inches between the units shown.