I worked at a company many years ago in graduate school that engineered and manufactured professional-grade calibration microphones, spectrum analyzers, sound level meters, and dosimeters. Each device cost premium $. And today I just pressed a “Get” button on my iPhone, itself a miracle, and suddenly I have, for free, a spectrum analyzer and sound level meter with options for display, weighting, speed, peak and RMS, etc. And I haven’t even tried the magnetic field sensor option yet.
I have not yet verified and compared this system with calibrated equipment, but for quick acoustic analysis and troubleshooting purposes, this is a godsend.
Miraculous. Thank you developers for your hard work and talent in bringing this technology to the masses.