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I recently did a realignment on the Rostock and it occurred to me that this little tool (originally bought for my table saw) could help. For each tower, I placed the device on the table next to the tower, zeroed it (so it would use the table's inclination as a reference), and then put it up to the tower I was going to tighten. Each time, I rotated the Max so that the tower would be sitting over the same area on the table, in case there was any difference. I found it was fairly easy for each tower to be off by well over a degree! This wouldn't matter much for short prints, but for tall ones, you don't want the towers wandering relative to each other - you want them as close to perpendicular as possible.

With this tool, I got the towers a lot closer to straight up and down. One is 0.2 degrees off, another is 0.3, and the last is 0.6. That's about as good as I could figure out how to get it.

I have one of those and never thought to use it. Thanks for the great idea!