Measuring waterlevel of Aquarium with SRF01 ultrasonic sensor

hi there,

I plan an automation project including the waterlevel-measurement of an aquarium. I found in the DFRobot-Shop the "SRF01 ultrasonic sensor". Now the question is, if this piece is waterresistant? Or in minimum if it is able to work properly in a place with very high humidity?

If not, does anybody know an arduino-compatible ultrasonic-sensor that is suitable for my project and does not cost too mach?

Would be great if I could get a quick answer.

Thanks so far.

Greetings,
stetsc