Like The Fifth Dimension said- let it shine… on your lawn! No need to listen to the weatherman or flip a coin to decide whether or not to water. The sensor pictured above measures both rainfall and temperature. If it is sunny and warm, it will automatically increase the watering times for your next scheduled irrigation. If it is cloudy and cool, it will decrease the amount automatically. If you already have a residential HUNTER irrigation controller installed you are halfway there. Just have your irrigation contractor install the Hunter SolarSync module. This Smart Controller is a great value for residential applications. It is a mixture of technology and simplicity at an affordable price. The settings are adjustable and can be customized for the microclimate on your own property.