
Sound Meter Pro is the 4th set of Smart Tools® collection (noise, vibration, seismometer).SPL(sound pressure level) meter app uses your built-in microphone to measure noise volume in decibels(db), and shows a reference. We had calibrated many android devices with the actual sound level meter with dB(A).REMEMBER!! The smart phone microphones were aligned to human voice (300-3400Hz, 40-60dB).Therefore the maximum values are LIMITED by the hardware...