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  2. Hydroponics - Wikipedia

    en.wikipedia.org/wiki/Hydroponics

    Electrical conductivity meters, a tool which estimates nutrient ppm by measuring how well a solution transmits an electric current. pH meter, a tool that uses an electric current to determine the concentration of hydrogen ions in solution. Oxygen electrode, an electrochemical sensor for determining the oxygen concentration in solution.

  3. pH meter - Wikipedia

    en.wikipedia.org/wiki/PH_meter

    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]

  4. 16 of the Best Gardening Tools on Amazon (No Green Thumb ...

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  5. Fertilizer injecter - Wikipedia

    en.wikipedia.org/wiki/Fertilizer_injecter

    Electrical conductivity meters (EC) and pH meters are used in conjunction to fertilizer injectors to ensure proper nitrogen and manage the pH balance in the soil. Using an EC, nitrogen level tests affirm that samples taken are showing that the mixing procedure for the injector is correct.

  6. The 10 Best Gardening Tools on Amazon

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  7. 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 ...

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