Clinometer, 1 Each

The Clinometer by United Scientific is a hand-held angle-measuring tool that locks its pivoting arm with a spring-loaded trigger to read angles up to 70° above or below the horizon. Combined with a measured baseline and the tangent of the angle, it gives the height of trees, buildings or a model rocket's peak altitude. Math, physics and earth-science teachers use it for outdoor trigonometry labs, and an activity guide is included.