The JSN-SR04T is an easy to use waterproof ultrasonic distance sensor with a range of 25 to 600 cm. If you are planning to use the ultrasonic sensor in an outdoor project or in industrial environment or to build a water level measuring system, then this is the sensor you need.

The sensor comes with a 2.5 m long cable that connects to a breakout board which controls the sensor and does all the processing of the signal. Note that only the sensor and the cable itself are waterproof, if you get water onto the breakout board, the sensor might stop working.

The main difference, besides it being waterproof, is that this sensor uses only one ultrasonic transducer instead of two. This transducer serves as both the transmitter and the receiver of the ultrasound waves.