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A typical residential water meter
Water metering is the practice of measuring water use. Water meters measure the volume of water used by residential and commercial building units that are supplied with water by a public water supply system. They are also used to determine flow through a particular portion of the system.
In most of the world water meters are calibrated in cubic metres (m3) or litres,[1] but in the United States and some other countries water meters are calibrated in cubic feet (ft3) or US gallons on a mechanical or electronic register. Modern meters typically can display rate-of-flow in addition to total volume.
Several types of water meters are in common use, and may be characterized by the flow measurement method, the type of end-user, the required flow rates, and accuracy requirements.
In North America, standards for manufacturing water meters are set by the American Water Works Association. Outside of North America, most countries use ISO standards.
^"Ofwat UK - Water meters - your questions answered" (PDF). ofwat.gov.uk. Retrieved 5 April 2018.
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