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Beckman Model M pH Meter, 1937 [1] Beckman model 72 pH meter, 1960 781 pH/Ion Meter pH meter by Metrohm. A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [2]
Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water.The quantity "1 ppm" can be used for a mass fraction if a water-borne pollutant is present at one-millionth of a gram per gram of sample solution.
The Melges 24 is a racing keelboat, built predominantly of fiberglass.It has a fractional sloop rig with a deck-stepped carbon fiber mast. The hull has a nearly-plumb stem, an open reverse transom, a transom-hung rudder controlled by a carbon fiber tiller with an extension and a retractable lifting keel with a weighted bulb.