For our monitor calibrations we use SpectraCal software and a C3 Colorimeter.
Out of the box using the Standard display preset it wasn't as finely tuned as we had expected, with a ColorChecker error of 3.96 and Greyscale error of 6.28. A level of less than 3 is normally the target.
It's a shame you didn't have a better meter to hand. The C3 is pretty ancient, wasn't brilliant when new, and will likely have drifted, plus it doesn't have any appropriate spectral corrections for the technology. There's at least an odds-on chance you've just adjusted the monitor to the meter's error.
If you still have access to the monitor and a spectrophoto/radiometer you should be able to see the scale of any meter error for this purpose.
At least it looks like it has some pretty good controls.
All could change with mini led or one day micro led,that will be revolution for monitors.
I mean that’s really not how it works, 384 zones for ~8.3million pixels is the same amount whether the screen is 27” or 85”.I'm not sure about this one but a lot of these expensive 27" models have 384 dimming zones, which means they're the same size as putting 1,536 on a 55" TV or 2,940 on an 75" TV.
Basically high end HDR monitors have been using Mini LED backlights for a couple of years now.
I think HDR 600 could well establish itself as the ideal product category