ME007-ULS UltraSonic Sensor Performance Experience?

Greetings,
I wonder if anyone here has had experience with using the ME007-ULS UltraSonic Sensor that is available online from Asian sellers?

I need a sensor with a range of 8M to monitor water level in a well. The spec for this sensor indicates it has a narrow 8 degree beam width which is what I need. I wonder if this sensor actually has 8M of range - is there anyone here that has tested it?

Also I noticed in the spec a comment that it defaults to 5M range. I wonder if one needs to send it a command to switch to 8M or if there are two different models, one for 5M and the other for 8M.

Thanks in advance for any enlightenment.