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Like how they work? Or what they are?
How they function ?
Are you talking about smart water meters or smart electrical meters or smart gas meters ? Smart electrical meters just take a reading of how much electricity you’re using at any period and send it to your utility. They can do so by reading the power draw at a specified rate and totaling it. They can then send that data off to your utility or if you’re using your own meter, to the service backing it.
How does it differ from a conventional meter ?
Electrical fields cause a torque in a motor that spins the counter wheels.
