I bought this microphone to use with my laptop, TrueRTA software and the MXL USB MicMate for frequency response measurements. I am very happy with the results. However, the microphone does not have a clear calibration curve. Instead, a generic calibration curve is listed on the panel. Currently, Parts Express is offering what appears to be a calibrated version of this mic for a few extra dollars, which may be cheaper for the DIY enthusiast.