The second of the LARGE spirit levels with a metal ball in the tube (various manufacturers). They seem to have a tendency to stick to small/slow movements. It upsets me too much. Think you're on the level then come back or rock the camper and you're gone. What's the use of looking from the driver's seat if you have to get out and jump onto the trailer and then start over? I ended up with a smaller one that just uses an air bubble. Glad I didn't drill any holes.
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