Auto-darkening welding helmet WH01 Filter size (mm) : 110X90X9 Viewing field: 92x42mm Optical class: 1/1/1/2 Shade control: Light states: DIN 4 Dark states: DIN 9-13 Sensitivity Control: Variable adjusted by internal knob Switching Time: Lightdark:1/25,000sec Delay Time: Dark-Light:0.1- 1.0sec Variable adjusted by internal knob UV-IR Protection: Up to shade DIN16 at all time Arc Sensors: 2 Low TIG amps rated: 10amps(DC/AC) Operating Temperature: -5℃- +55℃ Storing temperature :-20℃ --- +70 ℃ Power Supply: Solar cells +Replaceable 1*CR2032 lithium battery Power Control: Automatic Grinding Function: Yes