How can I effectively use a stud finder for plaster walls to locate studs for hanging heavy objects securely?

To effectively use a stud finder for plaster walls, start by selecting a stud finder suitable for plaster walls. Hold the stud finder against the wall and slowly move it horizontally until it indicates the presence of a stud. Mark the location and repeat the process to find additional studs. Once you locate the studs, use them as secure anchor points for hanging heavy objects.