The easy way to check that your base 2x6's are square is to measure corner to ... but it can be difficult to make it level. Use a bubble level and clamps to adjust the height.

carpentry projects must be square, level ... themselves and might not prove as accurate. Boards are level or plumb when the bubble is centered in the appropriate vial. Technology has improved ...

Its square head includes a bubble level and a scribe, and the 24-inch blade length should be able to handle even large-scale measuring jobs. All of the components in this kit also fit neatly ...