Rise Digital Protractor Inclinometer Angle Slope Measuring Device to Measure Absolute and Relative Angle Range 4 x 90&deg; with V-Groove Magnet Base Base plate has V-groove with built-in magnets for attaching on curved surfaces or cylinders 3 in 1 Versatile measuring tool: Angle Finder, Protractor and Level 360 measurement range allows you to work both horizontal and vertical planes Measuring range of 4 x 90 with 0.1 repeatability Large and clear LCD display with 0.1 resolution