Sound spectrum analyzers on iDevices

I’m surrounded by expensive equipment that I don’t know how to properly engage. So I bucked up and got a sound spectrum analyzer for my iPhone. I need to detect specific bands and thus needed to search hard. 

I’m wondering how accurate these microphones and analyzers are. It seems pretty accurate. The polling looks quick enough and I’m generally seeing what I expected. Just curious. If I need to I can always go back to the series equipment and ask for help. 

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