- Climax CLEAR OUTER LENS suitable for 420 and 421 Auto welding MasksSpecial Price £1.95 £2.34Climax Auto-Darkening Welding Mask With Variable LensSpecial Price £39.95 £47.94PROLINE WELDING AUTO HELMET & PAPR - AIR PURIFICATION SYSTEMSpecial Price £378.69 £454.43Climax 420 Variomatic Plus Auto Darkening Welding HelmetSpecial Price £29.95 £35.94