1,Four suspension wires and magnetic damping action ensure stability, even under rapidly changing atmospheric conditions, vibration and shock. Extended compensator range of ?15 minutes. 2,Compensator lock protects instrument during transport or storage; also acts as a handy compensator checking tool. 3,Incorporates an endless horizontal motion drive with two knobs for fast and easy aiming. Operable with the right or left hand. Simply turn the instrument, then use the fine motion feature to precisely aim the level at the target. 4,Telescope optics are bright and clear. The 1 foot (0.3m) minimum focus distance makes it easy to use in confined locations. 5,The stadia lines on the reticle allow easy calculations of distance. Simply multiply the distance on the rod between the top and bottom stadia lines by 100. 6,FAL series levels are equipped with an easy-to-use horizontal circle for measuring angles (direct reading to 1?or 1 gon).