rotameter

ro·tam·eter (rō tam′ət ər, rōt′ə mēt′ər)

noun

an instrument for measuring the rate of flow of a fluid by means of a movable float inserted in a vertical tube

Etymology: rota + -meter

Converse of object

set: Set the rotameter to 4 litres/minute and check the oxygen rotameter setting has not changed.

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