Using the DeWalt DWHT43003 Torpedo Level is easy. Just place it on the surface you want to measure. For measuring angles, slopes, or pitch, use the rotating vial to align with the desired position. When taking readings, look at the magnified center vial for clear results. As for maintenance, keep it clean by wiping it with a soft cloth after each use. Avoid dropping it as the shock might affect the accuracy of the vials, even though the rubber end caps offer some protection. Store it in a dry place to prevent any rusting or damage to the aluminum body.