Wiktionary
flowmeter
n. Any of various devices used to measure the flow of a fluid through a pipe, etc.
Usage examples of "flowmeter".
The long, slow gray-green lift and fall of the ground swell was all of a towering five inches high, so I took it a mile off the beaches and fooled with the rpm and the fuel flowmeter, until she was riding right and sounded right and just a hair under 3,000 on each of the 120-horse stern-drive units.
She looked down the shadowy line of Fremen, saw Stilgar with Paul standing beside him and the watermasters emptying their load into the pool through a flowmeter.