Compare room noise before changing your setup
Keep the phone in one place and repeat a simple A–B–A test to compare fan settings, an open window, or two spots in a room.
Measurement basics4 min read
Sound measurement guides
Compare the noise in a room and make sense of the reading on your screen.
4 guides
What does a browser decibel reading mean?
Why two devices can show different levels, and which number to use when comparing noise on one device.
The 3 dB rule and decibel averages
A worked example explains energy averages and why browser estimates do not belong in occupational exposure tables.
How to align a browser reading with a reference meter
Use a steady 10-second sample to calculate a display offset, then check where the match holds.
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