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> opened the decibel meter on my iPhone.

Really? What's the effective dynamic range of the iPhone mic?

Here's an interesting post at the CDC on this very topic:

The app I used ("Decibel 10th") was not one of the benchmarked apps so I will switch to using two of the tested apps for future measurements.

Just get a real recorder like a Zoom or Tascam, they are cheap and miles better than any phone.