http://studiosixdigital.com/
The Audiotools suite
to this can be add the follow optional modules
FFT
ETC
Impulse Response
SmaartTools I
Transfer Function
Transmission Loss (STC)
SPL Pro
SPL Graph
SPL Traffic Light
Polarity
Speaker Distortion
Impedance (meter and sweep)
STI-PA
VU Meter
THD+n
Phase Meter
Amplitude Sweep
They have an interface that connects to the dock connector and will allow you to measurement microphones and calibrate it to the software.