over 1 year her

I am close to completing the install of my EG4 3000 AIO, which I intend to use for my essential circuits like my microwave and refrigerator. But then it occurred to me that since they are essential, I don't want to take a chance on damaging them with dirty power.

So I am in the market for an oscilloscope to verify that the inverter is putting out clean power, and I am soliciting recommendations. I am willing to pay for quality, but I don't expect to use it very much, just testing inverter output (so it has to be able to handle high voltage) and maybe fooling around with hobby electronics, so I don't need a top of the line model. Say about $300 tops.

Any recommendations?