Abstract: A modular housing for enclosing an electrical meter or metering type instrument is adapted for housing one of a plurality of modular type electrical meter or metering instruments, including instruments with or without a readable display. The housing includes at least one open end for receiving an instrument or instrument components and an interchangeable closure member for closing the open end. The closure member has a first connection means for inter-engagement with the open end of the housing and second connection means for mounting the instrument to a surface such as a wall or a connector rail, preferably a DIN rail. The housing may be used for surface, panel and rail mounted instruments of the same type.