B&B Pipe and Industrial Tools HP100SC PPM Handy Purge, Self Calibrating Weld Purge Monitor for Pipe Welding

It is the most economical user-friendly monitor in the market accurately measuring the oxygen levels in the purged weld areas, to let the welder know when is the correct time to start welding. For continuous monitoring during the welding process connect one end of the rubber hose to the sensor adapter and leave the other end outside the purging area to let the residual oxygen flow away from the welding area. The device