A sealed package’s transmission of oxygen, water vapor, carbon dioxide, or other gas or vapor that is of interest because of its potential adverse effects on the package contents is determined indirectly, based upon the package’s transmission of a different gas selected as a test gas. At least one of the electrodes includes one or more anchoring arrangement, such as opening through the electrode through which the non-conductive material can pass; anchors that extend away from the electrode and into the non-conductive material of the paddle body; or flow-through anchors attached to the electrode with an opening through which the non-conductive material may pass. A pivot rod of the retaining sleeve is led through a pivot hole of the rotary connector and fixedly located at a water inlet hole of the valve body thereof via ultrasonic wave or fastening agents.