<strong>04. </strong> The Millermatic 211 Auto-Set was built with ease of use for the average consumer in mind. On the back there is a big, white “On/Off” switch, and on the front there are two dials; one for wire speed and one for material thickness. The switch on the lower right of the welder is used if you’d like to weld aluminum with an optional spool gun. Left of that switch is an over-temperature indicator light.