Digital Angle Finder：This Angle Measuring Ruler serves as a Multi Angle Measuring Ruler, making it a Digital Inclinometer Protractor for woodworking Aluminum Alloy Marking Ruler：Use this Angle Measuring Ruler as an aluminum alloy marking ruler with a folding arm, where the metal ruler for cutting locks at any angle, letting the angle measurement tool transfer angles directly to workpieces without separate protractors Angle Finder Tool：This angle finder tool version of Angle Measuring Ruler has a magnetic base that attaches to steel surfaces, making the Multi Angle Measuring Ruler suitable for pipe fitting or machinery setup, while the Digital Inclinometer Protractor measures relative angles between two surfaces Metal Ruler for Cutting：For metal ruler for cutting, this Angle Measuring Ruler includes a scribe line for marking, with the angle measurement tool having a hold function that freezes the reading Woodworking Angle Tool：While the Multi Angle Measuring Ruler stores flat, and the angle finder tool includes a bubble level that confirms horizontal alignment before taking measurements