Sellstrom SH9-13 ADF Replacement Lens With variable shades from 9 to 12, this replacement has sensitivity and delay adjustments with a full digital operation and weld/grind control. Adapts to the vast working environments with the ability to control the shade of the lens and adjustments for sensitivity from ambient lighting sources. The replacement ADF filter is battery and solar operated and built with four independent sensors positioned to reduce possibility of blockage during welding. . Pack of 1