Use this check to inspect a browser, device, network, permission, media, or input capability directly in the current runtime before relying on it in another workflow.

Display probe

Display probe supplied by the surface.

Analyze a display probe into refresh rate, resolution class, and pixel density estimates. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Refresh rate (Hz)

Measured refresh rate in hertz.

Refresh class

Nearest common refresh-rate label.

Width (px)

Viewport width in CSS pixels.

Height (px)

Viewport height in CSS pixels.

Resolution class

Classification of the shorter side.

Pixel ratio

Reported device pixel ratio.

Issues

Stable machine-facing degradation codes.

• Results describe the current browser session and can change with permissions, privacy controls, hardware, drivers, network path, power state, or browser updates. Unsupported or withheld information is not proof that the underlying capability is absent.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Repeat the check in the browser and device that will actually be used, then confirm important behavior with the relevant operating-system or network diagnostics. Avoid granting permissions that are unnecessary for the test.

• Webcam Tester

  Diagnose a webcam from a captured frame probe, reporting verdict, frame rate, and resolution.

• Audio Output Tester

  Diagnose audio playback from an output probe covering rate, channels, latency, and underruns.

• Battery Checker

  Assess a battery probe, reporting charge state, estimated runtimes, and low-charge warnings.