This device is an electrochemical cleaning and treatment machine specifically for stainless steel, produced by the Italian company Nitty-Gritty. The model shown in the picture is Spot Clinox (or belongs to the famous Clinox series). Main Uses and Functions: This device is primarily used in workshops and factories after welding operations (such as TIG or MIG welding) to perform the following functions: Pickling: Cleaning the discolorations and blue or brown colors resulting from welding heat and restoring the shiny appearance of the metal. Passivation: Rebuilding the protective chromium oxide layer automatically to protect the stainless steel from future corrosion and rust. Polishing: Giving shine and consistency to the weld surface to match the rest of the piece. Electrochemical Marking: Some versions of this series allow for printing permanent logos or text in black or white on metal surfaces.