The M12 soldering iron refers to a Milwaukee cordless soldering tool that runs on Milwaukee’s M12™ battery system (12 V). Unlike traditional corded irons, this battery‑powered soldering iron provides portable, reliable heat for electrical, automotive, control panel, and field work without needing a plug‑in power source. https://omertools.com.au/product/milwaukee-m12si-0-12v-li-ion-cordless-soldering-iron-skin-only