I bought this mask to manufacture a body guard 11m long. I wonder how I could do without it until now. really convenient !! impeccable headband, adjusting the brightness impeccable, lightening and darkening immediate. I had to change the batteries once in 11 days of daily use during 5/6 hours a day. I highly recommend to those who need soldering even relatively intensely, but he has not even when the strength of a pro mask. associated with an inverter station, the arc welding is really accessible to all and as usual, Amazon to top
