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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]
This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. American multinational home improvement supplies retailing company The Home Depot, Inc. A Home Depot in Onalaska, Wisconsin Company type Public Traded as NYSE: HD DJIA component S&P 100 component S&P 500 component Industry Retail (home improvement) Founded February 6, 1978 ; 47 years ...
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Moisture meters are measuring instruments used to measure the percentage of water in a given substance, as physical properties are strongly affected by moisture content and high moisture content for a period of time may progressively degrade a material. Meters exist for various substances, including wood, building materials, concrete, and soil.
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The nitric acid flush of meltwater may cause a sharp, short term, decrease in the drainage water pH entering groundwater and surface waters. [7] The decrease in pH can solubilize Al 3+ that is toxic to fish, [ 8 ] especially newly-hatched fry with immature gill systems through which they pass large volumes of water to obtain O 2 for respiration.
These sprinklers can be fixed spray heads that have a set pattern and generally spray between 1.5 and 2 m (5 and 7 ft), full rotating sprinklers that can spray a broken stream of water from 6 to 12 m (20 to 40 ft), or small drip emitters that release a slow, steady drip of water on more delicate plants such as flowers and shrubs.
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