metering apparatus which employs a structure conforming to long accepted industrial standards but which is adapted to meet the requirements for highly versatile solid - state meter circuits having a multitude of outputs both in terms of electrical signals and visual display . the meter structure is provided an emf and rf barrier coupled to through the interconnection of the meter cover to neutral reference . further , a key actuated switching input is provided through the cover face of the meter with the use of a pattern of contact surfaces positioned on the inner surface of the face . these surfaces cooperate with spring biased contacts arranged to achieve proper contact with them when the meter cover is rotated into its latched orientation . a separate terminal block is provided which is coupled through a multi - lead connector to the meter circuit and which provides discrete individual terminal outputs readily wired by utility personnel trained in the use of older mechanical metering systems .