Miller’s Auto-Set automatically adjusts voltage and wire speed based on your wire diameter and material thickness. The 212 comes with Miller’s Material Thickness Gauge (PN 229-895) so you can accurately set the material thickness, then set for your wire size. The blue light comes on and you’re in Auto-Set mode. Or, you can adjust the welder manually the old-fashioned way. Unlike older machines with the setting information inside the drive cover, the 212 has an EZ-Access consumable compartment located under the flip-down parameter chart right at the front of the machine.