Best Sound Meter (sound pressure level) is an app which can measure the actual sound level meter with dB. We have prepared for You special ads free version. It uses your built-in microphone and shows a reference. You have to know that the built-in microphones were aligned to human voice (300-3400Hz, 40-60dB). Therefore the maximum values are limited by the hardware limitation, and very loud sound (100+ db) cannot be recognized. Remember that it's only a device for fun and please use it as an auxiliary tool.