Tool is perfect for caulking around the house specially if you have arthritic hands. The very bright light is extremely useful in illuminating dark corners needing caulking. It's such a pleasure to use that I am looking for more caulking jobs to do. The lowest setting is all that is needed to do most caulking around windows. Sealing cracked mortars in patio and brick walkway may require higher settings. This is an essential tool for the home owner!