There are many ultrasonic ranger module on the market, but sometimes, these kind of sensor needs to work in conditions more than the Lab. This water proof ultrasonic sensor meets this requirement. It has a good performance and almost the similar usage like HC-SR04 module.
Note: Version 2.0 requires echo pin to be pulled up to VCC. A 4.7K to 10K resistor can be used as pull-up resistor.