407764 Datasheet, PDF (11/12 Pages) Extech Instruments Corporation. – Datalogging Sound Level Meter

Appendix - Typical ‘A’ Weighted Sound Levels
50 HP Siren (100')
130
Jet take-off (200')
110
Riveting machine
90
Subway (20')
Pneumatic drill (50')
70
Vacuum cleaner (10')
Large store
50
Small office
Residential area (night)
30
Whisper (5')
10
Threshold of hearing
140
120
100 ^{Chain saw}
Boiler room
80
Freight train (100')
Speech (1')
60
Large Office
Residence
40
20 ^{Sound studio}
0
11
Model 407764 Version 2.1 9/07