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... +/-5uV deadband confirmed, but no hysteresis. I would say it is perfect for 10uV resolution for this price.
I do see hysteresis on the DCV function, but not noticable on uV. I observe it needs to read a value one or two counts over the present reading before it updates the display.
I can see the AN8008 meter uses a slow and fast filter in software, for display. The slow filter is ~2seconds. The fast is msec I'm guessing.
For fast changing signals, the meter uses the fast filter's value and if/when the derivative settles, it switches to displaying the slow-filter's value.
If you quickly connect the probes from 0V to 5.000V, it sometimes grabs (fast filter value) 4.930V and after 2 seconds goes to show (slow filter value) 5.000V
For quick changes slow filter gets "primed" by the fast filter, to speed display response time.
It's not perfect but works well enough if you wait.