Battery Replacement - Extech Instruments 407727 User Manual

Battery replacement

Remove the battery compartment cover on the rear of the meter by removing the cover screw. Replace 9V
battery and compartment cover.
Typical A Weighted Sound Levels
50HP Siren (100')
Jet Takeoff (200')
Riveting machine
Chain saw
Subway (20')
Freight train (100')
Vacuum cleaner (10')
135db Speech (1')
120dB Large store
110dB Large office
100dB Residence
90dB Night residential area
80dB Whisper (5')
72dB Sound studio
68dB
62dB
58dB
48dB
42dB
32dB
24dB