For the price of the product it's great.It will get your Eq close enough you can finish by ear.

I have been using one of these for years. Then I upgraded my phone and tablet to Samsung Android devices. Uh-oh, no headphone jack. I started out with one of the inexpensive usb-c to 4-pole headphone jack adapters. I could not get it to work, until I discovered the trick: you have to plug in headphones to get the adapter (actually a dac and adc built into a connector) to turn on. It worked, but SQ was not great, and dragging around headphones just to activate it was a pain. Then I tried the RDE AI-Micro usb interface. That thing worked right out of the box. Now I can do impromptu testing of live band sound, room acoustics, sound system behavior, etc. I am using the Sound Spectrum Pro App, which has an RTA mode that can run at 1/24th octave resolution. It is an amazing combination.

Easy to use probably not as accurate as the more expensive ones but will get your set up in the ball park

I used this microphone to measure the speakers in a three-way speaker rebuild. I used REW to test the speakers and then VirtuixCAD to design the crossovers based on the results of the tests. Being a newby to all of this, I don't know if I did everything correctly or if REW is even supposed to be used for this purpose, but the end product sounds great to me.One thing to note: I also got the recommended mobile app for Android, which seemed to work, but after a lot of back and forth I went with REW. Maybe I should have tried the ascending tone in the app rather than pink noise (which REW uses), but I felt more confident in the REW result.Another thing to note: in REW, I would recommend choosing to do multiple cycles (or runs) for each test, and it will automatically average them.