The Seco 8.5-Foot TLV Aluminum Prism Pole 5530-10 has alternating red and white markings for surveying jobs as well as dual graduations. These graduations are in hundredths of a foot and centimeters. At the bottom of the pole is an adjustable tip. This prism pole is constructed of wear-resistant aluminum. It extends to 8.53 feet and collapses to 4.97 feet. Its soft, rubber knob easily loosens to adjust your length and tightens to lock your desired length. Attached to this 1.25-inch diameter prism pole you will also find a level vial with 40-minute sensitivity. And the 5/8 x 11-inch thread located at the top of the prism pole simplifies the process of mounting a variety of surveying instruments.