After a decade or so, my Dell U2412M is showing a few small gray spots on the screen, which I cannot explain or remove. I would like to replace it with another 24" or 27" monitor, 1440P or 2160P, mid range price, Dell or otherwise.

The Dell U2412M is calibrated with a MonacoOptix tool. The monitor's ability to adjust each RGB channel separately is a great help. A replacement must have this feature.

The monitor is primarily used for web browsing, some movie mirroring to a 4K TV, and occasional Photoshop editing.

Would appreciate suggestions. TIA.