ESAB 0700000400 External Shade Adjustment, Black External shade adjustment between DIN 9 and DIN 13 and optical class 1/2/1/2 Delay and sensitivity can be adjusted from the inside Four arc sensors for higher response and wider coverage and a large viewing area of3.85 x 1.88 in. (98 x 48 mm) Wider field of vision and increased spatial awareness Sensitivity control is an adaptable feature useful when welding low amperages (GTAW) for better reaction to darker arc light