Sound Pressure Meter

音圧メーター（SPL）は、ノイズ測定のためのものです。

Sound pressure meter (SPL) is meant for noise measurement. It calculates in Decibel or dB. It collects the noise from environment.

Levels of Noise In decibels (dB) according to American Academy of Audiology (www.audiology.org):

140 dB - Gun shots, fireworks

130 dB - Jackhammers, Ambulance

120 dB - Jet planes taking off

110 dB - Concerts, Car horns

100 dB - Snowmobiles

90 dB - Power tools

80 dB - Alarm clocks

70 dB - Traffic, vacuums

60 dB - Normal conversation

50 dB - Moderate rainfall

40 dB - Quiet library

30 dB - Whisper

20 dB - Leaves rusting

10 dB – Breathing

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