An apparatus and method for sensing characteristics of a liquid are disclosed. The exemplary embodiment may have an electrode for transmitting electrical signals associated with characteristics of the liquid to and from the liquid. The electrode may have an aperture on the interior of the electrode with the aperture surface in contact with the liquid. The electrode may have a sensor portion in contact with the liquid and a coupling portion with a tapered thread. The electrode may contain an electrical coupling on the isolated outer surface of the electrode for communicating the electrical signal from the electrode.