UNI-T UT391A+ digital laser distance meter has 100 data records and recall function, laser distance meter spirit level tool, auto correction and error report technology, battery status indication, automatic/ manual power off function, compact and handheld design, portability, measuring range 80m, accuracy 2mm / 0.079in,class II laser, laser wavelength 635nm, laser output <1mW, self-calibration -9mm to +9mm, data storage 100 groups, size 120 x 55 x 28mm and weight 112g.