lukasSirh:
Hello I tested the sensors and works fine. I tested it like depth measurement...
Fantastic! Glad to hear it works fine! That's great!
But please explain the details of your test(s) and show the results, because those things are not at all clear. For example, when you say you "tested it like depth measurement," do you mean that you put the sensor slightly below the surface of a deep pool, as recommended, and you were able to use the sensor to measure the depth of the pool? But your test code (in your uppermost code window) doesn't include pulseIn, so you can't measure distance, even in air. And you didn't use the NewPing library as recommended.
So it seems your test was not valid.