How can I present water level in a pipe?

[saman_artorious]

what is the best component or whatever tool I can use in cuttie to
present the water level changes in a pipe or a tank?

your

[ChrisW67]

Ask the person who has to use it. Personally, I think a vertical QProgressBar might make a reasonable quick visual reference of current levels, but your user might need an exact figure so a simple QLabel might be a better choice. If you need history a QListView might be good, or even a Qwt plot.

[code_err]

QProgressBar looks like a tank of water :)