Using this Empire magnetic tool box level is easy. First, place it on the surface you want to measure. The magnetic edge will hold it firmly in place, making it convenient for hands - free operation. For pipes or conduits, use the V - Groove edge for accurate alignment. Read the vials to determine the level, plumb, 45 - degree angle, or pitch. When using the VARI - PITCH™ vial, check the markings to get the pitch measurement. As for maintenance, keep it clean by wiping it with a soft cloth after use. Avoid dropping it or subjecting it to strong impacts as it may damage the vials. If you have any issues, refer to the limited lifetime warranty provided.