As I said in my post, we use the Entech for some base-line audible noise measurement because its easy to use, see and hear, not because its a definitive measuring tool.
We also use DTCD Analysis, Fluke and full-spectrum power-analysis, which lend themselves less-well to a simple video demonstration and not at all to audible ones.
I use the Entech when I travel because its easy to carry and demonstrate. As I said, our current products demonstrate improved noise measurement using the Entech, but that's far from the most significant measurement that enables our products to perform well in audio or medical applications. They are handy and fun to use, certainly.
Grant
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