a coupling device which removably couples the portable measurement device to a port in the moveable barrier operator, the measuring circuit generating an impact force signal representing {HEAD ~ an impact force measurement} and effecting {TAIL ~ transmission} of the impact force signal from the interface to the movable barrier operator 
a coupling device which removably couples the portable measurement device to a port in the moveable barrier operator , the measuring circuit generating an impact force signal representing { HEAD ~ an impact force measurement } and effecting { TAIL ~ transmission } of the impact force signal from the interface to the movable barrier operator
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