DD201-type B single-phase watt-hour meter is the abroad advanced technology, the careful design and manufacture of a new generation of single-phase and long life technology, used for measuring and watt-hour than frequency for 50 Hz ac ac active power

DD201-type B single-phase watt-hour meter is the abroad advanced technology, the careful design and manufacture of a new generation of single-phase and long life technology, used for measuring and watt-hour than frequency for 50 Hz ac ac active power