The Stanley Fatmax Stud Finder 400 is a versatile and reliable tool designed to help you locate studs, joists, and other hidden structures behind walls. Whether you're a professional contractor or a DIY enthusiast, this stud finder is an essential addition to your toolkit. In this article, we'll provide an overview of the Stanley Fatmax Stud Finder 400 and its manual, highlighting its key features, operating instructions, and troubleshooting tips.