: Digital 360 Degrees V-Groove Magnetic Protractor Angle Finder Meter Inclinometer This protractor uses angle sensor technology to calculate exact angles simply by tilting it to the desired angle. ; The LCD that provides reading that is always displayed in upright position in any angle. ; Placing the meter on reference surface zero to measure relative angle gives measured angle result within 0.1° accuracy. ; It also has Absolute Angle Measurement to test whether the working surface is on the level to check roof slopes, wheel alignment, etc. ; With simple self calibration no other fixtures is needed. The V-Groove ensures it sits flat against any metal surface (such as miter, table saws, etc.), round objects, curved surfaces or cylinders such as pipes, shafts or rods while the 2 powerful magnets on bottom plate for secures the attachment. With care you can also use it on aluminum or wood. Features : V-groove base plate with strong built-in magnets. ; Full range 360° measurement allows you to work both horizontal and vertical planes. ; Dynamic measuring tool : Angle Finder, Protractor and Level. ; Measuring range of 4 x 90° with 0.1° repeatability. ; Large and clear LCD display with 0.1° resolution. Hold Data feature. ; Simple self calibration, calibrates the meter to any reference surface. ; Display remains upright enabling viewing at all angles. ; High-impact, high-precision machined aluminum framework. ; Angle sensor technology calculates exact angles in any position. ; Fast and accurate measurement. ; Zero reference can be set at any angle. ; Compact & portable design. ; Absolute and relative measurement conversion. ; 3V Lithium battery lasts for 2000 hours in continuous use. Specification : Measuring Range : 4 x 90° (0 - 360°) ; Resolution : 0.