3Pcs Plant Watering Alarm Humidity Moisture Sensor

Description This is a plant watering alarm as simple as that You put it into the soil near a plant and it emits a tiny chirp when the soil is dry reminding you to water the plant It uses capacitive humidity sensing as opposed to resistive humidity sensing this means it does not make an electric contact with the soil avoiding electrode corrosion and soil electrolysis and resulting in better accuracy and longer battery life Special care has been taken not to make it yet another source of annoyance This sensor will be silent when its dark and will restrict itself from making too much noise The alarm level can be set for each plant individually As water is consumed by the plant it will detect the low moisture level and will start to emit rare short chirps As more water evaporates it will increase the alarm rate This sensor can detect if its day or night by measuring the amount of ambient light and will not make noise when its dark Package included 3 x Plant Watering Alarm Sensor