Extech Instruments HD600 User Manual page 9

Typical A-Weighted Sound Levels
50HP Siren (100')
Jet takeoff (200')
Riveting machine
Subway (20')
Pneumatic drill (50')
Vacuum cleaner (10')
Large store
Small office
Night residential area
Whisper (5'0)
Threshold of hearing
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dBA
140
130
120
110
Chain saw
100
90
Boiler room
80
Freight train (100')
70
Speech (1')
60
Large Office
50
Residence
40
30
Sound studio
20
10
0
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9 HD600-EU-EN v1.3 07/13