The electric meter, is also called electrical meter, watt hour meter or energy meter (220V, 50HZ), is a kind of device to measure the electric energy consumed by residence, enterprise or electric equipment. Using a watt hour meter for metering can provide a key window into your energy consumption and ultimately your energy bill. Users can accurately monitor energy use in real time, rather than waiting until the end of the billing cycle.
Watt hour meter (Three Phase Smart Card Meter) is a kind of watt hour meter, which measures the electric energy consumed by the house in kilowatt hours. The meter has a counter in kilowatt hours. The energy consumption is calculated by calculating the reading difference of the counter in a specified period of time.