DDS22 Single-phase Electronic Watt-hour Meter adopts special large-scale integrated circuit, high-performance parts as well as advanced SMT technology. Therefore, the meter is characterized with high accuracy, tamper-proof function, high anti-interference, and long service life. The meter is easy to operate and can meet the customers' requirements well for its reasonable design. It is the optimum product for customers and public utilities. Functions and Characteristics: Accuracy Class: 1.0class The meter adopts special anti-magnet impulse meter reading mechanical register to prevent strong disturbance form external AC, DC magnetic field. Flat error curve, stable for temperature and time, and reliable. To cumulate both direct and reverse energy, prevent tamper of reversal of lines. Light weight, reliable structure. Easy to be handled and installation. Anti-tamper in condition that load is connected between the line and the earth. The meter can also prevent U ring short circuit and other tampers. Low consumption: ≤ 0.6W Distant-motion-width-determination pulse output and multifunctional output ports . 20units/Pack