The dial-type inclinometer TKL4450 is adjusted by a rotary knob so the tool can be used for measuring inclines with a single hand. Also, the magnetic base alslows you to use it hands-free on ferrous metals. This is especially useful while working within Railway Industry (NOT FOR USE ON THE LIVE LINE) to mark accurate angles. The tool is manufactured from an impact-resistant, heavy-gauge ABS plastic case which ensures it's durability.