What is the best tool for measuring a very long conduit run?

The best tool for measuring a very long conduit run is a measuring wheel. A measuring wheel is specifically designed for measuring long distances with ease and accuracy. It allows a user to walk along the route while the wheel records the distance traveled. This method is particularly efficient for long runs, where using a tape measure might be cumbersome, especially if the space is open and clear.

In contrast, a long tape measure, while useful for straight measurements, requires more effort and can be prone to inaccuracies over long distances due to sagging or bending. A measure pull string tape is suited for laying out curves or measuring depths, but it might not be practical for very long stretches. Experience could provide insight into estimating distances, but it lacks the precision that a measuring wheel offers. Thus, for accuracy and convenience over long distances, a measuring wheel is the optimal choice.