{HEAD ~ An apparatus} for determining the density of insulation in a cavity of a structure includes a sensor that is held in {TAIL ~ a substantially fixed position} relative to the insulation for sensing the force of the insulation against the sensor 
{ HEAD ~ An apparatus } for determining the density of insulation in a cavity of a structure includes a sensor that is held in { TAIL ~ a substantially fixed position } relative to the insulation for sensing the force of the insulation against the sensor
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