Inclinometer,simple style in plastic housing

Inclinometer,This small simple instrument is used to quickly measure the angle of inclination by an observer on the ground to a point that is either higher or lower than the observer.Angles up to 50 degrees  either sise of (zero= viewing horizontally) can be measured.

The instrument consists of a small plastic housing carrying a special pivoting scale. One end of the housing has an eyepiece and the small hole is at the end furthest from the eye. During aiming the small hole is positioned exactly over the target reference point.