Offering weld and grind modes, Tweco® weighs 16 oz, has 3.86 x 1.69 in. viewing area, and will darken when TIG welding even at 5 A. Solar power eliminates need to change batteries, and helmet switches from light to dark in 33 µsec and vice-versa within 3 selectable ranges: 0.25–0.35 sec, 0.35–0.50 sec, and 0.50–0.80 sec. Sensitivity and delay knobs on outside of helmet shell allow for adjustment while welding, while recessed lens design helps prevent faceplate scratches when set down.
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