In article , Jerry Foster
says...

And a wide variety of instruments are used to make the various measurements.

It's true you could use a yardstick and measure two distances,
so it would be 20log(10)d1/d2 to give distance, say, measured
in dB form. Or weight, with a scale. Or a simpson meter
measuring some dc voltage.

But I think he was probably after a 'sound power level meter'
even though he didn't come right out and say 'sound' in
his question. :^)

Jim


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