This display offers a hold function and can be inverted 180° for easy reading when the tool is upside down. Designed in-house by General's engineering team, this precision specialty tool is perfect for installing crown molding, cabinetry, counters, staircases, roofs, windows or flooring. It features a 6" (150mm) stainless steel pivoting protractor arm with a knurled locking nut and one-button zero calibration, which ensures accurate readings every time. Take the guesswork out of measuring, marking and reading angles on your next woodworking or home improvement project. The UltraTECH Pro-ANGLE Digital Protractor displays absolute and relative angle measurements in a large, easy-to-read LCD window, making it the perfect tool for installing crown moldings, cabinetry, counters, staircases, roofs, windows or flooring. One-button zero calibration ensures accurate readings every time. Effortlessly calculate angles by simply swinging open the 6"inch stainless steel pivoting arm, which can be locked in any position. For user convenience and comfort, the display offers a hold function and is easily inverted, or flipped, 180 degrees for reading upside down. Angles in any plane can be measured with accuracy to 0.1 degree and 0.05 degree resolution anywhere within a 0.00 to 180 degree range, making this tool useful for many applications. Professionals and technicians in the woodworking, automotive, industrial, aerospace and medical industries will find the Pro-ANGLE Digital Protractor especially helpful.