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A real longshot this one, I was welding up some big material on my large machine tonight, A kemppi Marc 500 with a LHF 300 high frequency head... I could have really done with it in pulse mode, or at least duel current mode...I know it does this but as its pre inverter and is unlike the mastertig which is easy to set, I have never figured out the modes, I have a fealing I need to set a second trigger on the torch along with the latching on the footswitch, If anyone has ever used one of these beasts then I would be greatfull........