The Topcon ATP2 360 Degree Prism has a standard 5/8 x 11 threading and was perfectly developed to meet the needs of auto-tracking. It can hold any of the RCPR-4 or RC-5 remotes that are compatible with the Topcon PS and DS, as well as the Sokkia SX and DX instruments.
Also, the prism was built with -7mm offset and its six precision-ground corner cubes are mounted in a rugged rubberized housing with a solid metal core. This advanced 6-prism configuration provides unsurpassed measurement precision due to a minimum offset of each prism center. Designed to be used with various instruments, ATP2 is the most accurate 360-degree prism designed for use with a standard range pole.