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Analog Sound Level Meter
Sound waves are not mysterious or insubstantial, they can be measured. Sound measuring devices, more commonly called sound meters allow anyone to measure the intensity of the sound waves around them. They work just like a thermometer, or a voltmeter, in that a higher temperature or voltage will produce a higher number on the meter. The Sound Level Meter shown above is reading 59, the range switch is set on the 60 range, and the needle is at (-1).
Analog meters work just like their digital brothers, the only difference is that a needle moves showing sound level changes instead of digits changing. A moving needle is often times easier to notice, as it will not move at all unless sound levels get near the selected range.
For Further Reading check out these links for Other Types of Sound Meters
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