Accuracy boundary

SOUNDTEST.PRO is a documentation aid, not a certified meter.

The web app estimates sound levels through the browser microphone and Web Audio API. Device microphones, system gain, browser processing, and calibration settings affect every reading — here is exactly what the tool can and cannot guarantee.

Supported

What it supports

A/C/Z weighting estimates, Fast/Slow response, LAeq, L5/L10/L50/L90/L95, 1/3 octave display, calibration context, and report exports.

Boundary

What it cannot claim

No IEC 61672 Class 1/Class 2 certification, no judicial timestamp authority, and no guaranteed 24-72 hour lock-screen browser monitoring.

Devices

Why phones differ

iOS devices tend to be more consistent than Android, while Android and desktop browser input chains vary widely across hardware and software.

Best practices

How to use it well

Record repeated sessions under similar conditions.
Keep distance, room, windows, and equipment state in notes.
Use calibration only with a reference sound level meter or acoustic calibrator.
Keep exported media and reports together for context.

Formal measurements should be verified with a certified sound level meter and qualified procedures. Local hashes prove export consistency only; they are not authoritative timestamps.