Wayne Parham Messages: 18835 Registered: January 2001
Illuminati (33rd Degree)
That's the only tape measure I've seen that's calibrated in frequency, correlated with wavelengths at the speed of sound.
However, it's just a convenience (albeit a pretty cool one) because all sound professionals understand the significance of interference from adjacent sound sources and self-interference caused by boundaries. The distance between sound sources and reflections determines the frequencies that are impacted. It's pretty much acoustics 101.
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