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