The culmination of our long search for a device which could produce precise angle readings on table saws and other shop equipment, the Tilt Box is a digital inclinometer that will read relative angles to an accuracy of +/- .1. Turn it on, place it on your saw table and press the "Zero" button once to establish relative zero. Then attach it to your blade by means of the rare earth magnets on its sides: it will register the relative angle between the blade and the table on a large, easily read display. As a bonus, if you press the "Zero" button again, the Tilt Box will also measure absolute zero, which means that you can also utilize it as a portable pocket level. The Tilt Box is powered by an 9 volt battery, which is included.