Bed System Measurement Device Products cannot be sold on Amazon.com, through fulfillment on Amazon.com, or to any other vendor who intends to sell on Amazon.com or any 3rd party site (B4000)The B4000 Bed System Measurement Device reduces the risk of life threatening entrapment by quickly testing the 4 critical entrapment zones of a hospital bed system per the Food and Drug Administrations Hospital Bed System Dimensional and Assessment Guidance to Reduce Entrapment guidelines.