Inert gas welding requires the exclusion of oxygen from the weld zone during the welding process. Before the welding process, the residual oxygen concentration must be reduced to the required minimum. The Handy Purge is specially designed to display oxygen concentrations down to 0.01% and accurately measure oxygen concentrations down to 0.1%. Within this zone, welding and making welds without oxygen is completely safe (exceptions are special metals such as titanium, zirconium, etc.). The Handy Purge 100SC has a "NEW" upgraded oxygen sensor that does not require calibration after each use. This results in faster and more accurate oxygen concentration readings, down to 0.01 percent [100 parts per million]. It can be used both for continuous monitoring during the welding process and for taking samples. Routine quality control checks are greatly simplified with this device. The analyzer works with all cleaning and argon welding systems. It is small, easy to use and has a robust housing. Features and benefits - Does not require calibration after each use. - Minimum waiting time. The device tells you exactly when the residual oxygen concentration is low enough to start welding - Reduced consumption of cleaning gas. Accurate monitoring of residual oxygen prevents unnecessary consumption of cleaning gas and allows you to produce oxygen-free welds. - Superior welded seams. Top quality is guaranteed, as premature welding and thus a porous, colored or even charred weld can be avoided.