Soil Moisture Sensor

Can be used to detect soil moisture when making an automatic plant watering system. 
Consists of the module, detection probe and connecting wires. 
Digital and analog outputs. Has an adjustable potentiometer to modify the sensitivity to humidity and moisture.
When the soil moisture is less that a set threshold value the digital output increases and when the moisture 
exceeds the threshold set the digital output will decrease.
Operating voltage: 3.3 to 5V
PCB size: 30mm x 16mm
Probe size 60mm x 20mm

Arduino compatible.