Noise destroys your hearing|工具線上App不用買

Noise destroys your hearing is Sound Level Meter also known as a decibel or dB meter, for your iPhone.- Sound Pressure Level130 dB : Threshold of pain120 dB : Threshold of discomfort110 dB : Rock music, Screaming Child100 dB : Subway train, Blow dryer90 dB : Factory machinery at 3ft.80 dB : Busy street, Alarm clock70 dB : Busy traffic, Phone ringtone60 dB : Normal conversation at 3ft.50 dB : Quiet office, Quiet street40 dB : Quiet residential area, Park30 dB : Quiet whisper at 3ft, Library20 dB : Rustling leave, Ticking watch- How much noise can cause permanent damage?110 dB : 1 minute noise can cause permanent damage100 dB : 15 minutes noise can cause permanent damage97 dB : 30 minutes noise can cause permanent damage94 dB : 1 hour noise can cause permanent damage91 dB : 2 hours noise can cause permanent damage88 dB : 4 hours noise can cause permanent damage85 dB : 8 hours noise can cause permanent damage75 dB : 24 hours noise can cause permanent damage

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