The machine allows you to switch between MIG and Stick welding easily. This is particularly useful for general fabrication where you might MIG weld thin car panels but switch to Stick welding for thicker, rusty outdoor structural steel.
While you can still find this manual and use the machine effectively, note that the CEM Dual MIG 120 is a (heavy copper windings). Modern inverter welders (e.g., Titanium, Forney, YesWelder) are lighter and more efficient. However, transformer welders are nearly indestructible. If your CEM Dual MIG 120 still works, the manual is your best friend for keeping it alive. cem dual mig 120 manual