Soldering irons with stepless power adjustment

Smooth reg. power

— the presence of smooth power adjustment in the design of the soldering iron. Note that in many models, the actual power of operation directly affects the heating temperature, so smooth control is often referred to as temperature control, and not as power control. Anyway, such control is more convenient than step control, because it allows you to set almost any value within the adjustment range and to fine-tune the tool to the specifics of certain jobs.