Digital ProtractorAircraft rigging with precision. Whether your angle measuring needs demand a protractor, level or angle finder, this has you covered. You'll wonder how you lived without one of these. Used for: Flight control surface rigging Setting adjustable propeller blade angle Aircraft leveling and more Digital Display Specifications: Accurate to 0. 2 Can find both true level and be zeroed at any angle Display is backlit and easy to read at any angle IP54