ChrisNik 3 Feet Extension Arm for Pipe Mic II

The ChrisNik 3-Foot Extension Arm 1736ARM connects to the Pipe-Mic II and provides construction and surveying professionals with an additional 3 feet for measuring pipe inverts or pipe diameters. This extension arm is especially helpful for projects involving larger diameter manholes. It is used with grade rods that have graduations in feet, tenths, and hundredths of a foot.