This an excellent, professional-grade waterproof Ultrasonic Range Finder module for Arduino. It has a good performance and almost the same in usage as the common HC-S04 module.
Compared to the SR04T module, this module is easier to install and waterproof.
 

Features:

Small size, easy to use
Low voltage, low power consumption
High accuracy
Strong Anti-Jamming
Integrated with wire enclosed waterproof probe, suitable for wet, harsh measurement conditions