A device for measuring resistances associated with electrical contacts of a contact ring used in a semiconductor wafer electroplating process. The method comprises enabling multiple applications that operate on the mobile computing device to generate notifications in response to event occurrences. The present invention also provides methods for the preparation of stable formulations of ACE inhibitors, especially enalapril maleate. An actuator ring is moveable between positions engaged with and released from the end segments of the first ring.