A method and apparatus is provided for raising poultry, such as chickens, for food production. The pressure of fluid carried by a vessel or tube is measured by measuring a change in shape of the vessel or tube via a sensor element contacting it. The device is tubular and has a cylindrical or other shape cross section and can be constructed of material so as to be either disposable or nondisposable, the nondisposable version being capable of heat or chemical sterilization. Media content, the locally encrypted program key and the service encrypted program key are re-encrypted periodically to ensure the security of the media package.