Which component helps read the slope angle on a gradeometer?

• A. The protractor in the top corner
• B. The ruler at the base
• C. The digital display
• D. The compass

Answer: (B)

Reading the slope angle on a gradeometer relies on its calibrated scale, which is the base ruler. When you align the instrument with the slope, the line of the slope intersects the ruler at a point that corresponds to the incline’s angle. That intersection value is read directly from the ruler’s scale, giving you the slope angle or gradient. The other components serve different purposes: a compass shows direction, a digital display would show a numeric angle but isn’t the traditional reading method here, and a protractor at a corner isn’t the primary reading tool on this device. The base ruler is the part that translates tilt into a readable angle.