Abiotic factors are tested in the following ways:
Abiotic Factor How is it Measured?
Light intensity Light meter
Temperature Thermometer or thermistor
pH Soil pH test or electric probe and meter
Oxygen Oxygen probe and meter
Relative Humidity Hydrometer
Levels of ions Soil test or electric probe and meter
Soil moisture or soil humus Soil tests
Organisms are also sampled, can't identify every organism present, so representative samples are taken, either with random or systematic sampling.
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