What tool is commonly used to measure incline or horizontal measurements?

The transit and theodolite are essential tools in surveying and construction for measuring angles and distances, making them highly effective for determining incline and horizontal measurements. A transit features a rotating telescope that allows the user to measure horizontal and vertical angles accurately. The theodolite, which combines the features of a transit with added precision and additional capabilities, is also designed specifically for measuring angles in both the horizontal and vertical planes. This precision is vital when establishing lines of sight for various projects, ensuring accuracy in layout and construction.

In contrast, other tools listed serve different purposes. For example, a borescope is primarily used for inspecting inaccessible areas by providing a visual examination rather than measuring angles or distances. An analog inclusion data system is generally utilized for data collection rather than direct measurements. Alignment sights are used for determining line of sight but are not specifically designed for detailed angular measurements like the transit and theodolite. Thus, the transit and theodolite are recognized as the most appropriate choices for measuring incline and horizontal measurements accurately.