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Read screen, viewport, scaling and colour capability signals.
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Files and inputs stay on your device. Use Reset to clear this workspace.
Useful to know
What does this tool establish?
Screen dimensions are exposed in CSS pixels. Multiplying by device-pixel ratio estimates a backing size; it does not verify native panel resolution. Browser zoom and monitor changes affect values.
Does this certify the screen?
No. Browser signals, calculations and visual observations cannot certify physical panel specifications or defects.
Where are my files and inputs processed?
Calculations and observations stay in this tab. Optional observation saving starts off and uses only this device. Turn it off or use Clear observation to remove that saved note. Downloaded reports remain on your device.
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