Checking your work for level and plumb is crucial. Here’s how to select and use the right tool for the job. I recommend using a fiberglass level. It’ll absorb shock well and won’t bend or get knocked out of calibration. Two-foot levels are the most commonly used but to check for level over a longer distance, move up to a four-footer. Or you can attach a two-by-four with equal spacers to make a straightedge.
For more on tools, consider: