I had a 72" centec level for a number of years and rarely used it.I mainly use it for plumbing up door jams.
Of course the vial in the 90 degree direction lost some of the fluid over time and no longer worked. Harbor Freight said there is only a 90 day warranty on the level and they now carry Pittsburg levels which has a limited lifetime warranty. So no exchange possible.
It has been my experience that most of their product warranties are meaningless and not worth the paper it is written on.It was only a $20 purchase at the time so I guess you get what you pay for.