With its carefully calibrated auto-collimation, determining height differences has never been easier. The AT-B4A features fast and accurate automatic compensation, and has an extremely short minimum focus distance of 20 cm, ensuring reliable results in any weather conditions. Fine adjustments can be made through an endless drive, and horizontal angles can be directly read in either 1 gon or degree steps. Additionally, the device offers precise work through endless fine adjustment of the side, and has a protection class of IPX6.