Unique patent-pending digital protractor displays absolute and relative angle measurements in a large, easy-to-read LCD window. It features a 6” (150mm) stainless steel pivoting protractor arm with a knurled locking nut. Self-calibrating, one-button zero function 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, and 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 a wide variety of aviation applications. Use for sheet metal layout, control surface deflection measurements, propeller pitch adjustment, and any place else requiring a precise angular measurement. 1 lbs (0.5Kg) shipping weight.