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2. pH meter - Wikipedia

   en.wikipedia.org/wiki/PH_meter

   A simple pH meter Soil pH meter. In general there are three major categories of pH meters. Benchtop pH meters are often used in laboratories and are used to measure samples which are brought to the pH meter for analysis. Portable, or field pH meters, are handheld pH meters that are used to take the pH of a sample in a field or production site. [19]

3. pH indicator - Wikipedia

   en.wikipedia.org/wiki/PH_indicator

   A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. [1] Hence, a pH indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the ...

4. List of measuring instruments - Wikipedia

   en.wikipedia.org/wiki/List_of_measuring_instruments

   pH meter: pH (chemical acidity/basicity of a solution) photometer: illuminance or irradiance planometer: area polarimeter: rotation of polarized light potentiometer: voltage (term is also used to refer to a variable resistor) profilometer: surface roughness protractor: angle psychrometer: humidity pycnometer: fluid density pyranometer: solar ...

5. Far-right influencer Nick Fuentes says armed man came ... - AOL

   www.aol.com/far-influencer-nick-fuentes-says...

   Far-right political pundit Nick Fuentes answers question during an interview with Agence France-Presse in Boston, Massachusetts, on May 9, 2016.

6. Christina Aguilera Poses Nearly Nude to Mark Her 44th ... - AOL

   www.aol.com/lifestyle/christina-aguilera-poses...

   Where to shop today's best deals: Kate Spade, Amazon, Walmart and more. See all deals. In Other News. Entertainment. Entertainment. People. Kaia Gerber and Austin Butler split after more than 3 ...

7. Soil test - Wikipedia

   en.wikipedia.org/wiki/Soil_test

   In agriculture, a soil test commonly refers to the analysis of a soil sample to determine nutrient content, composition, and other characteristics such as the acidity or pH level. A soil test can determine fertility , or the expected growth potential of the soil which indicates nutrient deficiencies, potential toxicities from excessive ...