Altimeter Precise functionality and comfortable handling with a long-life cycle Indicator and scale systems are integrated into a rugged metal case and dampened from outside influences. The pistol-shape makes using the Haga altimeter easy, comfortable and accurate. Height is determined based on the known manner of measuring the angle between the altimeter's position and the top of the tree.Precise functionality and comfortable handling with a long-life cycle Height is determined based on the known manner of measuring the angle between the altimeter's position and the top of the tree.