Sound Meter is in the 4th set of the Smart Tools collection.<br><br>Have you ever suffered from the noise of the neighbors?<br>SPL(sound pressure level) meter app uses your embedded microphone to measure noise volume in decibels(db), and shows a reference.<br><br>REMEMBER! Most smartphone microphones are aligned to human voice (300-3400Hz, 40-60dB). Voice calls do not require high-performance microphones.<br>Therefore the maximum value is LIMITED by manufacturers, and very loud sound(100+ dB) cannot be recognized. Moto G4 (max.94), Galaxy S6 (85dB), Nexus 5 (82dB), HTC Desire(82dB)...<br><br>See 6-7th images. I calibrated major android devices with an actual sound meter (dBA). You can trust the result in routine-noise levels (40-70dB). Please use it as an auxiliary tool.<br><br>* Main features:<br>- Upside down mode<br>- Level notification<br>- Line-chart duration<br>- Material design<br><br><br>* Pro version added features:<br>- No ads<br>- Vibrometer<br>- Statistic menu (line chart)<br>- CSV file exporting<br><br>* Do you want more tools?<br>download [Sound Meter Pro] and [Smart Tools] package.<br><br>For more information, watch YouTube and visit the blog. Thank you.