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2. pH meter - Wikipedia

   en.wikipedia.org/wiki/PH_meter

   The pH meter is calibrated with solutions of known pH, typically before each use, to ensure accuracy of measurement. [11] To measure the pH of a solution, the electrodes are used as probes, which are dipped into the test solutions and held there sufficiently long for the hydrogen ions in the test solution to equilibrate with the ions on the ...

3. 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 ...

4. pH - Wikipedia

   en.wikipedia.org/wiki/PH

   The pH of aqueous solutions can be measured with a glass electrode and a pH meter or a ... The first electronic method for measuring pH was ... the accuracy of pH ...

5. Glass electrode - Wikipedia

   en.wikipedia.org/wiki/Glass_electrode

   The bottom of a pH electrode balloons out into a round thin glass bulb. The pH electrode is best thought of as a tube within a tube. The inner tube contains an unchanging 1×10 −7 mol/L HCl solution. Also inside the inner tube is the cathode terminus of the reference probe.

6. Category:Measuring instruments - Wikipedia

   en.wikipedia.org/wiki/Category:Measuring_instruments

   Clap-o-meter; Class of accuracy in electrical measurements; Clifton nanolitre osmometer; Clinometer; Cole's quadrant; Compressometer; Constant fraction discriminator; Continuous-scan laser Doppler vibrometry; Corrosion monitoring; Cover meter; Creep-testing machine; Creepmeter; Cross bow quadrant; Current clamp; Cylindrical coordinate measuring ...

7. The must-see documentaries of 2024 - AOL

   www.aol.com/must-see-documentaries-2024...

   In a year in which it seemed every great luminary got a moment under the documentary lens, it can be a bit difficult to parse out which were must-see. This list will have you covered.