—
dB(A) approx · hit Start
—
Min
—
Leq
—
Max
—
L10
—
L50
—
L90
Compliance logging
Calibration
Hold this phone next to a real (calibrated) SPL meter with steady noise playing, then adjust this offset until the two readings match — on the same weighting (A/C/Z) you plan to use. Saved on this device. Re-check if you switch weighting, since the offset can shift slightly with the frequency content of your reference noise.
Phone microphones aren't calibrated instruments and vary between devices. This reading is only meaningful after calibration against a real SPL meter, and even then it's approximate — the A/C weighting curves here are rough biquad-filter approximations, not IEC 61672 certified. Useful for day-to-day monitoring and trending — not a substitute for a certified meter if you're disputing a noise complaint.