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Antra Solar Power Auto Darkening Welding Helmet is extremely fast responsive to electric arc from TIG, MIG, MMA or Plasma applications. This light weight welding helmet is so versatile that it can be used on grinding, cutting and welding applications. It is a perfect upgrade for goggles and fixed shade glass welding helmet at a fraction of cost. *Features: – Fully automatic power ON/OFF.- Knob to adjust sensitivity and delay setting- UV/IR Protection: Permanent Shade DIN13 – Hard hat adapter (Sold separately)- Battery indicator and testing- 6 Ext. and 1 Int. Lens covers included. *Specifications: – Viewing Area: 98mm x 44mm / 3.86″ x1.73″- Cartridge Size: 110mm x 90mm x 9mm / 4.33″ x 3.54″ x 0.35″- Optical Class: 1/1/1/2- Reaction Time: 0.00004(1/25,000) Seconds – Dark to Light: 0.1-1 Seconds- Light State: Shade DIN 4- Dark State: Shade DIN 5-9/9-13- DC TIG Amperage Rating: >2 Amps- Battery Type: Solar Cell + 2X CR2032 installed (Replaceable) – Helmet Material: High Impact Polyamide Nylon- Operating Temperature: -10°C- 55°C (14°F-131°F) – Meet Standards: ANSI Z87.1 / EN379 CE / CSA Z94.3 *Spare parts list: – Exterior lens covers: Amazon ASIN# B00CIOKN6C- Inner lens covers: ASIN# B00CIXN50O- Head Gear:ASIN# B01N5HCMIX- Hard hat adapter: ASIN#B075FCZJZH, B075FH4J4C – Sweat Band: ASIN#B073XT6CCQ – Auto Darkening Lens: ASIN#B01M2DHSDR – Cheater Lens: ASIN# B017IDJKMK (Diopter various) *Note: Head gear may require simple assembly.