Sper Scientific 850013 Advanced Datalogging Sound Meter - Manual (Page 4)

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INTRODUCTION
The Sper Scientific Advanced Datalogging Sound Meter
(Model 850013) uses a single range of 30 ~ 130 dB. This
dynamic range eliminates the need to manually select and
change ranges, alleviating the problem of lost data
associated with range changes in auto-ranging models. All
test parameters are simultaneously displayed on a large,
bright backlit display that features 0.1 dB resolution and a
bar graph. Data can be stored in the meter or directly
saved on a computer through the PC interface.
This meter measures sound in decibels (dB). Although it is
used for a wide variety of other measurements in science
and engineering, the decibel is most commonly recognized
as a measure of the intensity of a sound wave. The decibel
is a unit of power ratio with the number of units equal to a
constant times the logarithm to the base 10 of two sources
of intensity.