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