The object is to provide an open showcase which enables setting and removal of a front glass at the top of the front wall of the heat insulating wall and which, even if the front glass is not set, improves the aesthetic appearance of the front wall top of the heat insulating wall. The dividing of the circuit pattern is performed in a manner that a aspect ratio A1 of the pattern of the cantilevered beam member is confined to not more than 100, and that a aspect ratio A2 of the pattern of the both end-supported beam member is confined to not more than 150. A time stamp is recorded with the digitized seismic data in non-volatile memory. The electrically conductive first contact is coupled with the first end of the superlattice and the electrically conductive second contact is coupled with the second end of the superlattice. The generated alert may then be output by the utility meter for communication to a central controller configured to process the alert message to identify an invalid node within the mesh network. The length of the shaft from the housing to the crossmember is approximately equal to the thickness of the external wall of equipment.