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Flow measurement
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===Piston meter/rotary piston=== Because they are used for domestic water measurement, [[piston]] meters, also known as rotary piston or semi-positive displacement meters, are the most common flow measurement devices in the UK and are used for almost all meter sizes up to and including 40 mm ({{frac|1|1|2}} in). The piston meter operates on the principle of a piston rotating within a chamber of known volume. For each rotation, an amount of water passes through the piston chamber. Through a [[gear]] mechanism and, sometimes, a [[magnetic]] drive, a needle dial and [[odometer]] type display are advanced.
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