Electronic Level

[FlyGuy65]

GemRed 82412 Mini Digital Level, $23 or so. Works fine. "Aim small, miss small" is why I like it more than the bubble style level, but it's probably overkill.

Also have a couple of bubble levels, and a Tacklife SC-L07 laser level that came in handy working on the wings.

[Bill Whitefield]

Thanks for all of the good input. It has been very helpful.