Super quick leveling with stabilized line of sight. Thanks to the finely tuned auto-collimation system, the Topcon line of AT-B autolevels are the ideal device for determining height differentials on busy and noisy job sites. With a completely new small lightweight design, they have excellent visibility of horizontal circle, superior gear ratio for shock and vibration and improved tangents and knobs. Features: 28x magnifications Rapid, accurate, and stable automatic compensation Ultra-short 20cm focusing All-weather dependability Endless fine horizontal adjustments