As soon as it starts to rain the sensor will pick up the moisture and record in the graph, and also trigger a automated icon outlook  the weather display,

The graph will recalled the rain duration period, and the story of the duration light rain  will Record a large reading heavy rain will show a lower reading 

This device imitates a leaf and records how much moisture is on the surface of vegetation

this as a scale from 0 -15  the device does not have a heater to dry the surface,  the surface  is dried naturally

This sensor records the amount of moisture in the soil the scale is 0 saturated 200 dry