The Inclinometer (or sometimes called clinometer) is a simple and self-contained device for measuring the angle of incline or decline from the observer to an object. The observer looks through the viewing tube and places the object in the centre of the 'sight' at the other end. A button is pressed to release a swinging pendulum graduated in degrees. After a stabilisation time of a few seconds, the button is released to clamp the pendulum firmly. The angle of incline or decline is measured on the scale.