Review on Folding Magnetic Level Beams: Enhanced Leveling for Optimal Results by Richard Sallah

Used for 6x6 poles to align for pergola/projection screen stands. This really helped when we poured concrete to further adjust and maintain the level. The only downside is that the tape only works up to a 4x4 rack. I just used twine to tie them to the posts. Worked great. Its worth it. Joining a regular level wouldn't work either.