Extech Instruments HD600 User's Guide download pdf (Page 9)

HD600–en-GB_V1.4 04/15

Typical A-Weighted Sound Levels

50HP Siren (100')

130

120

110

100

140

Jet takeoff (200')

dBA

Riveting machine

Chain saw

Subway (20')

Boiler room

Pneumatic drill (50' )

Freight train (100')

Vacuum cleaner (10')

Speech (1')

Large store

Large Office

Small office

Residenc e

Night residential area

Whisper (5'0)

Sound studio

Threshold of hearing

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Extech Instruments HD600 User's Guide Page 9