QuadLevel is the ONLY level on the app store that simultaneously gives you four displays – horizontal, vertical, diagonal and 2-dimensional. Unlike other levels, it responds quickly without the bubbles jumping around randomly. QuadLevel is also unique in that its horizontal, vertical and 2-D modes tell you in centimeters per meter or inches per 10 feet how far off you are from level or plumb. This allows you to figure out where a long board or countertop will end up – without having to do trigonometry!