Calibration and Repair Services
Extech offers complete repair and calibration services for all of the products we sell. For periodic
calibration, NIST certification or repair of any Extech product, call customer service for details on services
available. Ex tech recommends that calibration be performed on an annual basis to insure calibration
integrity.
Typical A Weighted Sound Levels
50HP Siren (100’)
135db
Speech (1’)
68dB
Jet Takeoff (200’)
120dB
Large store
62dB
Riveting machine
110dB
Large office
58dB
Chain saw
100dB
Residence
48dB
Subway (20’)
90dB
Night residential area
42dB
Freight train (100’)
80dB
Whisper (5’)
32dB
Vacuum cleaner (10’)
72dB
Sound studio
24dB
