soil, or grains • 3" diameter dial for easy reading • Calibrate with external reset screw • Thermometers meet ASME B40.3 ...

Temperature Standard thermometer Don't shade it. Light intensity Light meter Don't shade it. Position it facing maximum sunlight. Keep it steady. Soil pH Soil pH meter Make sure the probe is dry ...

The temperature of the air can be measured with a thermometer. The temperature of the soil can be measured with a temperature probe.