Hello wjyoung, Just so you know you only need your soil moisture level if you plan on using smart watering. You could purchase devices to calculate your soil moisture, but you could just enter it in off your best guess manually when first enabling smart watering for a zone. Once it is set it will adjust automatically based off your smart details, the weather, and recent watering history. Setting it at a lower moisture level will schedule longer, and more frequent watering cycles. Inputting a higher percentage will do just the opposite.