This Ultrasonic Distance Sensor is an industrial-grade sensor to measure distance. Interfacing with it is the same as another cheap ultrasonic sensor, but it offers better performance and is compatible with harsher environments, and is waterproof too! It can be easily interfaced with Arduino and Sample codes and projects are available.
There are many ultrasonic distance sensors in the market, but sometimes, this kind of sensor needs to work in vulnerable conditions. This Waterproof Ultrasonic Obstacle Sensor meets this requirement. It has a good performance and almost the same usage as an HC-SR04 module.