THE AUTOMATIC OPTICAL LEVEL WORKS LIKE A PRECISION TELESCOPE AND ALLOWS AN ARTIFICIAL TARGET LINE, THE HORIZONTAL REFERENCE TO BE CREATED AT A CERTAIN HIGHT.   THE HEIGHT DIFFERENCE BETWEEN VARIOUS MEASURING POINTS AND THE HORIZONTAL REFERENCE LINE CAN BE READ OFF USING A LEVELLING STAFF.   THE SELF-LEVELLING FUNCTION AUTOMATICALLY ALIGNS THE TARGET LINE BY ITSELF, GUARANTEEING MAXIMUM MEASURING ACCURACY IN ALL CONDITIONS.   MAGNIFICATION X 20.   IMAGE; ERECT, ACCURATE TO 2.5MM OVER 1KM DISTANCE.   FIELD OF VIEW 120 DEGREES.   OBJECTIVE APERTURE 34MM.   MINIMUM FOCUS 0.5M.   360 DEGREE CIRCLE.   COMPENSATOR RANGE 15 DEGREES.   COMPANSATOR ACCURACY 0.8".