A soil probe measures the relative humidity of the air around the roots of plants. It has a tip that goes into the soil, and it measures the relative humidity of the soil. A moisture meter on the other hand, measures the water potential of the soil. It does this by measuring the pressure inside a sealed chamber which is connected to the soil.
It is not as precise as the soil probe, but it is much faster. The soil probe will tell you how moist the soil is, and it will tell you how dry the soil is. The moisture meter will tell you how dry the soil is. Both are important, and knowing both can help you get the most out of your plants. A soil probe is the best way to measure the relative humidity of the air around your plants. It will tell you if there are any problems with the air around your plants. A moisture meter is great for measuring the water potential of the soil, and it will tell you how wet or dry the soil is. It is very useful to know what the water potential of the soil is, because it tells you how much water the plant needs.