Manufacturer
Plasma can be complicated to understand. Let me explain it as quickly and clearly as I can. Plasma cutters heat gas to the point that it melts metal. Once the metal has melted, the gas is used to blow it away. This is a complex science, but I will save that for another day. You can also research it yourself if you wish.
The closer M2 values are to 1, the more laser energy is delivered to the laser spot. It allows for the processing of thicker materials, with deep wells that are thin.