Using this Klein ACCU - BEND Level is easy. First, use the thumb screw to attach the level to the conduit. Make sure it's firmly in place. Then, start bending the conduit. The level will help you ensure that you're making a precise 90 - degree bend. When using it, always keep an eye on the high - visibility vial to check the accuracy. As for maintenance, after each use, wipe it clean with a dry cloth. Store it in a dry place to prevent the aluminum from rusting. Also, be careful not to drop it as it might affect the accuracy of the level.