5507-Series Quick Change™ TLV™ Prism Poles Aluminum5.18 - 11.81 ft  Dual Grads  No Locking Pin This pole is designed to be compatible with all targets, prisms, and GPS antennas. By using the correct SECO #2090-XX adapter —to achieve a target height of 150 mm— this or any of the poles in the 'Quick Change' series is used for GPS, robotic or total station surveys. The 'Quick Change' pole system features:• SECO TLV™ locking (TLV™ has 40-minute vial built in)• Aluminum outer pole • Dual graduation inner pole • Without locking pin This pole system is simple to use. To determine correct adapter, subtract 155 mm from your target height to find correct adapter length. Available as a carbon fiber or aluminum pole (see below).