This Water sensor can be used to measure the humidity of potting soil. But it also can be used to measure a water level.

Specifications:

• Working Voltage: DC 3-5V
• Working Current: <20mA
• Sensor Type: Simulation
• Detection Area: 40 mm x 16 mm
• Manufacturing Process: FR4 double spray tin
• Fixed Hole Size: 3.2 mm
• Humanized Design: Half moon sag nonskid treatment
• Working Temperature: 10 °C to 30 °C
• Work Humidity: 10% to 90% without condensation
• Size: 65 mm x 20 mm x 8 mm
• Optional Accessories: 3 pin sensor connecting line, Arduino 328 controller, Sensor relay shield