Model 407730 Version 1.3 June 2004
6
Support line (781) 890-7440
Technical support: Extension 200; E-mail: [email protected]
Repair & Returns: Extension 210; E-mail: [email protected]
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Typical A-Weighted Sound Levels
50HP Siren (100')
130
120
110
100
90
80
70
60
50
40
30
20
10
140
0
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
Residence
Night residential area
Whisper (5'0)
Sound studio
Threshold of hearing
Copyright
©
2004 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.
