A wattmeter is a meter of consumed electricity 

A wattmeter is a device that measures the voltage in the network, calculates the number of consumed kilowatts, costs per consumed kilowatts and shows the actual power of the devices in real time. It will help you understand how much energy the devices consume and what power they have. This is especially relevant during blackouts, when the amount of energy is limited and the question arises of what to turn on from alternative power, and what is better to turn off. But even without blackouts, the device will provide insight into energy consumption and where possible you can save your money.
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