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