A Biltmore stick, hypsometer and a ________ can be used to measure tree height?

The correct choice for measuring tree height among the listed options is a clinometer. A clinometer is an instrument specifically designed to measure angles of elevation or depression, which makes it highly effective for determining the height of trees. By measuring the angle from a certain distance from the tree base, a clinometer can help you calculate the height using basic trigonometric principles, making it a preferred tool in forestry.

Other tools mentioned do have their uses in forestry and measuring, but they serve different purposes. A laser rangefinder, for instance, also accurately measures tree height by employing lasers to calculate the distance to the top of a tree. However, it is not as universally recognized in the context of traditional forestry techniques as the clinometer.

A measuring tape is primarily used for direct linear measurements, such as the circumference of a tree or distances on the ground, rather than measuring vertical heights directly without additional calculations. A caliper is typically used to measure the diameter of trees rather than height. Thus, while all have relevance in forestry, the clinometer distinctly fulfills the requirement for measuring tree height effectively.