Earth:Staff (head) gauge
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A staff (head) gauge is calibrated scale which is used to provide a visual indication of liquid level. When used on an inclined or sloped surface, a staff gauge is usually calibrated so that the indicated level is the true vertical level.
Staff gauges are commonly installed at stream gauging stations to indicate the water stage. They are also used to indicate the water level (and hence flow rate) in open channel primary devices (flumes or weirs).
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