I know you were just using the laser to try and show it was out of level but you have to be careful with lasers when pointing them at an angle in to corners as they often lie! Wherever possible you should fire the laser at 90 degrees to the wall as if that wall is out it self and you fire it at an angle it won't give a true reading.
This was a little video I did a while ago to show it, hope it makes sense
yep= make sense CR. When i do wall paper i allways check where to start, where to finish how not to waste any paper etc etc.
I think i know what i'm doing, but i'm not expert like you. So it's good you are here, and i hope i could come to you for advice in the f:smilewinkgrin:uture