Permanently calibrated, this 415mm long level requires no setting-up. It has an extruded aluminium body with protective rubber end caps. The multi-function digital display features a backlight making it very easy to read wherever it is used. One of the function buttons allows you to choose between the actual angle and a relative angle between two surfaces. The other button controls the hold feature and the display light. The display shows both the angle in degrees and the inclination in mm per metre. With a digital accuracy of 0.2°, this level gives you an accurate, durable tool for all manner of jobs. Measurements read to 1 decimal place. Requires two AAA batteries.