Got this after a disappointing result with the iMM-6 model in hopes that the USB interface would eliminate the inaccurate inconsistent results - and I wasn't disappointed! I've attached a comparison of this UMM-6 with the other iMM-6 Dayton Audio measurement mic I initially tried - all 4 samples were standing in my fairly-quiet home office with a fan running in the next room and the appropriate calibration-file loaded for the serial-number microphone I had connected. Its unscientific, but shows the good device-independent consistency of the USB model vs the other.I use a USB-C to USB-A adapter to connect this to my tablet or smartphone, and the Android app AudioTool which seems to support the calibration files and provide easy to use readouts without noise of a PC fan to worry about affecting measurements.The tripod is REALLY hard to get on/off, I had to remove the rubber O-ring from the front to slide it on, but otherwise this seems very good. After loading the calibration data from the DaytonAudio website, it looks like it is providing an accurate representation of noise levels across the spectrum. I've also found it gives consistent readings across multiple devices which is reassuring for a measurement device.Its also VERY sensitive - when I attempted to see how quiet I could get it to read as I turned off fans, HVAC, holding my breath trying to not rustle my clothes I reached a point where even the florescent light subtle hum would slightly register at the low end of the scale barely above zero.