I have a dayton imm-6 and have downloaded the calibration file to the audio tool app on my android phone. However I find it difficult to use - by which I mean positioning it etc., yes I rigged some kind of a tripod etc., but for simple channel level balancing for ht, I prefer my old radioshack meter which died on me, hence I wanted something similar. For now I am using this, and the audio tool app is quite useful.
Cheers,
Sid