Improvements in utility meters

A modulised utility meter comprising a basic meter module, which is adapted for fixture in the premises of a consumer, and an 'add-on' module which is adapted to be received by the basic meter module, the modules each including a central processor unit (CPU), which serves to control operation of the module with which it is associated, which CPU includes a store for data appertaining to a quantity of the utility used as measured by meter means in the module of which it forms a part, and a comparator in one module which is arranged to compare the data of respective modules, and to provide an output signal in the absence of predetermined correspondence therebetween.

Improvements in or relating to electricity meters