Introduction
Congratulations on your purchase of the Extech 407732 Digital Sound Level Meter. The
407732 measures and displays sound pressure levels in dB from 35 to 130dB. The LCD
is backlit for viewing readings in dimly lit areas. User selectable features include
Frequency Weighting (‘A’ and ‘C’), Response Time (Fast and Slow), Max Hold, and
Range (High and Low). Careful use of this meter will provide years of reliable service.
Safety
Read the following safety information carefully before attempting to operate or
service the meter. Use the meter only as specified in this manual; otherwise, the
protection provided by the meter may be impaired.
Environmental Conditions
Altitude up to 2000 meters
Relative Humidity: 90% max.
Operating Temperature: 32 to 104
o
F (0 to 40
o
C)
Maintenance and Cleaning
Repair or servicing not covered in this manual should only be performed by qualified
personnel.
Periodically wipe the case with a dry cloth. Do not use abrasives or solvents.
