Can the Handler 140 handle different wire diameters?

Yes, the Quick Select™ drive roll can accommodate various wire diameters: .024 in (0.6 mm) and .030/.035 in (0.8/0.9 mm) for solid wire as well as .030/.035 in (0.8/0.9 mm) flux-cored wire (Page 3).

From the official Hobart Welding Products Handler 140 manual, page 3

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