Water and Wastewater Terms Beginning I

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indicator

A method of showing a change or measurment. A chemical indicator is a substance that gives visible change, usually of color, at a desried point in a chemical reaction, generally at a specified endpoint. An instrument indicator is a device that shows the result of a measurement, usuaully using either a fixed scale and movable indicator (pointer), such as a pressure gauge, or a moving chart with a movable pen, such as a circular flow-recording chart.