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Just picked up a Shopmaster 300 for a pittance, and in reading everything I can find about it it's unclear if the AC side is sine wave, balanced square wave or modified sine wave. Seems there are plenty of opinions (usually offered as absolutes) but no definitive reference, and of course the manual is mute on the point so it's no help. Which is why I'm here. If anyone has any fact-based evidence as to the actual output, I'd be exceedingly grateful for the sharing. I suppose I could put a 'scope on it and see, but I don't have one handy at the moment and being more than moderately lazy it's easier to ask...