Using the Bosch GPL100-30G is a breeze. First, insert the two AA batteries into the battery compartment. Then, you can use the Integrated Multi-Purpose Mount to set up the laser level wherever you need it. Once it's set up, turn it on and let the Smart Pendulum System do its job to self-level. You can then use it to accurately transfer and align level, plumb, 90° and grade points. When using it, make sure to place it on a stable surface to ensure accurate results. Avoid exposing it to extreme temperatures or moisture. For maintenance, keep the laser clean and free of dust and debris. Check the batteries regularly and replace them when they are low. If you drop the tool or notice any damage, have it checked by a professional before using it again.