A kit configured to be coupled to a moveable barrier operator and which measures the impact force exerted by the barrier when {HEAD ~ the barrier} moves from {TAIL ~ an open position} to a closed position, the kit comprising: 
A kit configured to be coupled to a moveable barrier operator and which measures the impact force exerted by the barrier when { HEAD ~ the barrier } moves from { TAIL ~ an open position } to a closed position , the kit comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH