
I mainly use LevelMatePRO; However, I needed an "old school" backup level to check that my camper trailer was level. It was also a replacement for a previous model with an adhesive backing that had fallen off the trailer. I just lay this on the frame to check the level side to side and then front to back. I didn't screw it into the frame or use glue. Just plug it in, check it out, take it off and put it in the tool bag. I want it to be magnetic but it doesn't have to be.

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Johnson Level & Tool 40-0912 Self-Leveling Cross-Line Laser Level, Red, 6 x 7 Inches
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