Jackson Safety Nitro Variable ADF Welding Helmet (21931), Solar Powered, Sensitivity and Delay Adjustments, Blue 2 Jackson Safety Nitro Variable ADF Helmets / Case, Blue Variable shade 9 - 13, sensitivity and delay adjustments; Viewing field 90 x 110 mm Lightweight - weighs only 1 pound fully assembled Three independent sensors; Solar powered, so you won't have to worry about changing batteries Meets ANSI Z87.1 - standards and is CSA compliant