Devices, methods and kits which, when installed or used, access, aspire, dilate, insufflate, drain or deliver fluid medicaments to, or place a patency device within a sinus area, such as a maxillary sinus or a maxillary sinus ostium. In order to obtain a robust weighing device and a more precise measurement at least one portion of the weighing device is arranged vertically above the discharge opening. The resulting cell has a region of increased lithium thickness proximate tounder the terminal end of the outermost edge of the cathode strip.