<p>The built-in knob type resistance regulator<br> Applicable to various types of TIG Welding Machine<br> Economical and practical　<br> Can be retrofitted to supporting Lincoln Miller and other brands <br> Suitable For: super 200p, wse200 and TIG 200P AC/DC,<br> 315P TIG-315P AC/DC and other tig welding machine </p>