The key to our success is the Acclima Digital TDT® soil moisture sensor. It is the only stable, absolute moisture sensor available. Our patented Digital TDT technology enables our sensor to do what no others can do. Trusted by research institutions across the country this sensor represents the best technology available.
Adding more sensors to your system is a simple process and will increase irrigating efficiency especially if you have different soil types on your property. 
Digital TDT Sensor