分贝仪-精准实时检测By Jia ChuanSheng ( Free )
Decibel Level Table 0-20dB is very quiet and almost impossible to feel 20-40dB Quiet, Soft Talk 40-60dB Normal, ordinary indoor talking 60-70dB noise, speak loudly "70-90dB is noisy and damages nerve cells" = "70-90dB is noisy and damages nerve cells"; "90-120dB ...