High Accuracy Accurate to the 0.1 at 0 and 90 and 0.2 from 189. Measure slope angles 4 x 90 total 360This version has no magnetic function Bright LCD Display Large bright green LCD provides better visibility, so you can easily read your measurements all day and night, even in the darkest spaces. The display value reverses automatically when the electronic level is upside down 2 Measuring Modes Press the hold button to enter absolute angle mode. The value will hold for easy to read. Press the REF button to achieve relative measurement mode 3 Measuring Units This inclinometer provides three different units of measurement selections degrees, grade, and INFT. You can change the required units in your measurement Audible Indicator This level will buzz when the level is getting close to plumb or level, helping to achieve a level and 90 degrees when your eyes cant see the display