Review on 🎙️ Dayton Audio iMM-6 Calibrated Measurement Microphone for iPhone, iPad, Android Tablets – Black by Nicholas Lim

I use it with AudioTools on IOS. The calibration process was easy following their instructions. It's accurate enough for anything that doesn't require special ($$) hardware. Mainly used for coarse calibration of pink noise sound systems. Accurate for SPL measurements within reason, I still get clipping at high SPL. I tested it on an old Radio Shack meter and it's close enough for everyday use where a few dB difference is acceptable. As a bonus, the TRRS connector has a narrow end so it fits into my phone without removing the case. Recommended for sound lovers.