"The CST/Berger 5-second digital theodolite with vertical tilt sensor offers contractors the best solution for angle and alignment needs. Single, Pair, or System Single, Accuracy 5-second angular, Battery Included Yes, Thread Size in. 5/8-11, Ratio 1100 Stadia ratio, Range ft. 450, Includes 6-key interface, Display Shows Angle/grade modes, Display Type Dual digital display, Magnification mm 30X, Power Source Battery, Style Theodolite. Provides 5-second angular accuracy with a vertical tilt sensor that compensates for tilts in the vertical axis, providing for more accurate angle measurements Includes optical plummet that allows user to align directly over reference point Can turn angles in left or right direction 30X telescope with 53in. minimum focus"