Step into the light and I'll tell you how its done..

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Hi", Geralyn, Lest say you want to level a ceiling in a room
that is 20ft wide. now get some clear plastic pipe
about 1/2" or 3/4" ( about 25ft in length ) mark the pipe with
a pen ( a nice straight mark and no too thick) about 12" from
the top of one end.( but before you do that ) messure from the
ceiling down 5ft and put a mark on the wall, now put the mark
that you have on the pipe to the line you have on the wall,
now the other end should also be about 5ft from the ceiling
on the other side of the room, fill the pipe with water, slowly
till the water comes up to the mark on the pipe, and in doing
so, the other end will also fill up to the level you have on
the wall,.
When the water in the pipe has stoped bobing up and down, you
have the hight you want ( 5 ft) you can rase or lower the end
that has no mark, and so now you can mark the other end of the wall