Soil pH meter

Soil pH meter

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Credit: SCIENCE PHOTO LIBRARY

Caption: A pH meter. This measures the concentration of hydrogen ions in soils. A small glass electrode at the end of a steel probe is pushed into the soil being tested. The presence of hydrogen ions changes the electrical potential between a test electrode and standard electrode within the probe - this difference is directly related to the pH (negative log of the concentration of hydrogen ions). The principal purpose is to show the acidity or alkalinity of the soil.

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Keywords: acid, acidity, alkali, alkalinity, analogue, analysis, aqueous, chemical, chemistry, dial, display, domestic, earth, electrode, galvanic cell, gardening, glass, ground, horticultural, horticulture, hydrogen ion concentration, laboratory, measurement, neutral, neutrality, number, numeric, ph meter, physical, probe, quantitative, quantity, school science, science education, soil, solution, test, testing, water

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