With the GARDENA Moisture Meter, soil moisture is taken into account for automatic irrigation. When the soil is sufficiently moist, automatic irrigation is not activated or stopped if it is in progress - thus saving water. In combination with the Battery Developers MasterControl Solar, MasterControl and MultiControl, irrigation is possible even with sensor control only. The Hygrometer is simply placed on the ground, next to the plants and measures electronically, long-term and reliably the temperature fluctuations in the soil. You can adjust the desired humidity level with the rotary selector. The display shows the current humidity level. The Hygrometer is equipped with a 5 m connection cable. Two 1.5 V alkaline batteries required for operation (not included). This ensures reliable measurement results for about a year. With discharged battery indicator. Note: The Hygrometer can be connected to the following products: the Battery Programmers MasterControl Solar, MasterControl and MultiControl, the Programmers T 1030 Plus, T 1030 Duo Plus, T 1030 Card, the Power Programmers 4040, 4030 and 6030, the Electricity Regulator and Watering Set for Jardinieres.