What to test, and what to replace it with
These tools exist to tell you whether a screen is worth keeping. If it is not, these are the panels worth running the same tests on instead.
LG C4 65 in OLED evo
The panel most of these test patterns are written against. OLED is where the dead-pixel and uniformity tests actually matter.
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Samsung S90F 65 in OLED
The main alternative to the C4 at the same size, and the one worth running the same tests on before you keep it.
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Calibrite Display Pro HL Colorimeter
Test patterns tell you something is wrong. A colorimeter tells you by how much, and fixes it.
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Dell UltraSharp U2722D
The safe QHD desk monitor when a test turns up a panel you do not want to keep.
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