What level provides accurate results within +/- 1/4 inch at a distance of 75 feet?

The level that provides accurate results within +/- 1/4 inch at a distance of 75 feet is the laser level. Laser levels are designed to project a continuous beam of light, which can be used to establish precise horizontal or vertical reference points over long distances. This allows for accurate alignment and leveling in construction and surveying tasks, particularly over larger areas.

The other types of levels, such as dumpy builders levels, spirit levels, and digital levels, may not consistently deliver the same level of accuracy at longer distances. For instance, while a dumpy builders level can be accurate, it typically requires more setup and may not maintain the same level of precision over long distances as a laser level. Spirit levels are usually employed for short distances and provide good accuracy but lack the extended range required for larger projects. Digital levels can offer good accuracy and some features for ease of use, but they may still not match the precision at longer ranges that a laser level provides.