The Seco 2-Foot Quick Change TLV Aluminum Prism Pole 5507-11 can be used by surveying professionals for GPS, robotic, or total station surveys. It has two adjustable sections that extend to 2.30 feet and collapse to 1.64 feet. These sections are completely securable with a soft, rubber knob lock that tightens and loosens easily. This prism pole's inner pole has dual graduations in feet, tenths, and hundredths of a foot and centimeters while its outer pole has alternating red and white sections. A 5/8 x 11-inch top thread on the included adapter allows you to mount various prism assemblies and its built-in 40-minute level vial makes it possible to quickly level your prism pole at any time. Constructed entirely of aluminum, this prism pole is both durable and wear-resistant.