Nikon HGA43210, AP-8, 28X, Automatic Level With Circle, 360 Degree 28x telescope with a 30mm objective lens for clear, bright images in an erect and unreversed orientation Built in compensator automatically levels the line of sight over a wide compensation range of 16-Inch with a setting accuracy of 0.5-Inch Minimum focusing distance of 0.75m/2.46 foot, standard deviation for a 1-km double-run level is just 1.5mm Horizontal tangent knobs have an unlimited range and can be operated with either hand, friction brake enables quick, easy setting Water resistant body construction allows use in light rain or dusty conditions, specially designed base plate for mounting on either flat- or domed-head tripods