With Memory
User's Guide
Digital Sound Level Meter
Model 407738
Introduction
Congratulations on your purchase of the Extech 407738 Digital Sound Level Meter.
The 407738 measures and displays sound pressure levels in dB (decibels) from 26 to
130dB in six measurement ranges. The microphone can be removed and remotely
stationed for convenience. In addition to the LCD numerical displays, a bargraph is
included for quick and easy viewing of sound level changes. Features include selectable
Frequency Weighting (‘A’ and ‘C’), selectable Response Time (Fast and Slow), Max
Hold, and a 99 reading storage utility.
Careful use of this meter will provide years of reliable service.
