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DDSY256 style are to use in measure the power electricity energy of single-phase 50Hz circuit. It is designed by making use of the high precision, wide measure range AP 7755 special digital and sem-industry electricity energy comes chip. It has the characteristic, such as the high precision, wide measure range, high reliability and low expense. The shape of this style is elegant which is adopted the special LCD or high light LED to show. In the same time, it also develop the characteristic of long life, free service. It provides the impulse output to benefit user measure or form the centralized copying ammeters system. It is a excellent product of national extending sharing-time price policy.