Professional welding helmet that gives instant eye protection as the arc is struck. Provides a clear view when not welding but instantly changes to the required amount of shade or filter when arc is struck. Adjustable headband provides a comfortable no-slip fit for hands-free working. DIN 3/11 Lens Lens Switching Time: 0.005Sec 1 Arc Sensors Suitable for MIG, TIG & Arc Welding Without Grinding Mode Adjustable Head Band Polycarbonate Construction DIN 3/11 Lens Lens Switching Time: 0.005Sec 1 Arc Sensors Suitable for MIG, TIG & Arc Welding Without Grinding Mode Adjustable Head Band Polycarbonate Construction