VMA306 - SR04 Vs SR05

Can we have sr05 module datasheet?
We where using a SR04 module and replaced it with vma306, but it only Works in same testing environments and with more erros than sr04. In real envirenment we have lots of erros and it Works only with sort distances… less than 50cm.
We would like to understand and correct our problem or we will have to use the older module.
It is used with arduinos to read water level


These are the specifications of the module VMA306.


Velleman Support.


I have a similar problem.
The sensor won’t detect any further than around 50cm.
Is there some kind of bug in the sensor or something?