Wood Magnet

From the website:
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Wood Magnet™

Though it contains no magnets, this versatile levelling tool attaches to joists, studs, and posts,

freeing your hands to position the work and fasten it in place.

U-shaped to straddle nominal 2" stock (i.e., 1-5/8"), it has a small amount of spring to provide clamping pressure, holding securely even in vertical applications (such as plumbing a wall).

The vial arrangement also lets you rotate it 90° for use on stock up to 6" square,

using the V-notch for registration and the elastic strap to hold it.

It can even be used to transform a long, straight board into a level for beams or sills.

Molded from high impact ABS, it has three level vials and a high-friction grip.

At only 8" x 3-3/4" x 2-1/2", it stores easily in a toolbox.
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$10.50.