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Waterproof Ultrasonic Distance Sensor A0221AU (3~450cm, UART, IP67) E-1027 Operating Voltage: 3.3~5V Average Current: <8mA Blind Zone Distance: 3cm Detecting Range(Flat object): 3-450cm Output: URAT Response Time:100ms Operating Temperature: -15~60℃ Storage Temperature: -25~80℃ Reference Angle: 60º Waterproof Grade: IP67

Water sensor brick is designed for water detection, which can be widely used in sensing rainfall, water level, and even liquid leakage. Water Detector / Sensor Connecting a water sensor to an Arduino is a great way to detect a leak, spill, flood, rain, etc. It can be used to detect the presence, the level, the volume and/or the absence of water. While this could be used to remind you to water your plants, there is a better Grove sensor for that. The sensor has an array of exposed traces, which read LOW when water is detected.