Turns out it helps if you use a device properly, who knew.

The edge can be controlled by the little icon at top left, and SINGLE mode stops updating once triggered (you have to press RUN to reset).

I accelerated the sweep rate, which helped detect some noise but at least it's matching the old scope now.

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It does have a few seriously good qualities: it's small, easy to deploy, and not overly complicated. Granted, the screen is small, but at least it can serve as a confirmation of what I see on the BK 1560.

One slight drawback, it seems to lag after a few minutes. It's as if internal storage has a problem managing all the data it accumulates. It gets progressively slower, it's very evident when you press the buttons (the beep gets progressively slower in response).

Still, it's not a bad buy. I'm definitely getting one with a larger display screen later.