| abstract |
A level includes a display screen and a control portion. The display screen has a central area which is located at a center of a cruciform of two groups of horizontal display units and two groups vertical display units. A plurality of display bars are located on two sides of each group of horizontal units and arrow-head-shaped horizontal indications are located at two respective remote ends away from the central area of the horizontal display units. The display screen includes a memory area (Memory), an alarm set area (SP), a calibration area (CAL), a resolution area (Resol), a pitching area (Pitch), and a rolling area (Roll). The control portion includes a mode button (MODE), a reset button (MEMO/SET), a calibration button (CAL) and an alarm set button (SP). |