Watt hour meter (Single-phase kilowatt-hour meter, 230V, 5(60)A, 50HZ) is a kind of watt hour meter which measures the electric energy consumed by the house. 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.
Using a meter to measure 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.