The measurement delta E is basically how close is what's being displayed to what it's supposed to be. A delta E of 5 is good, but these come pre-calibrated with a delta-E (∆E) < 2 which is super accurate. Each monitor is literally shipped with a calibration report just to give you the insurance that these have been through some serious quality control and I love that!

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I don't see a need to upgrade anytime soon, and it checks off all the requirements for what I need in a monitor. Awesome!