A modern design, multi functional auto-darkening helmet for use in a range of applications including precision TIG welding down as low as 2 amps. Optical Class 1/1/1/2 Cartridge Size 133mm x 114mm x 9mm Light State DIN 3.5 Dark State DIN 5-13 UV/IR Protection DIN 16 at all times Switching Time 1/25,000s Delay 0.1 1.0s Weight 0.5kg Operating Temp -10amp730C to 55amp730C Storing Temp -20amp730C to 70amp730C