Sound Level Meter (com.eonsoft.SoundLevelMeter) on Google Play
The sound level meter. (noise measuring aparatus) Every smart phone, there may be an error of the measured value. The noise of their surroundings, you can measure how much. Android 80 ~ 100db of sound to the maximum value of the equipment may vary. You're starting to sound measurement can check the maximum and minimum values. Noise measurements require precise high-performance, we recommend using the sound level meter.