A moisture sensor from Seeed Studio is a compact and easy to use device for detecting moisture levels in different substances. This sensor can detect a wide range of moisture levels and is useful for detecting soil moisture levels for plants, detecting water leakage in areas that may be prone to flooding and other water damage, and even detecting humidity in buildings. The sensor features three pins, including VCC, Ground and signal output, making it easy to connect to a variety of devices. An on-board potentiometer allows precise control over the detection range and LED indicators provide visual feedback.