Phonak Audiogram Direct - good option for DIY?

[pvc]

Real ear measurement vs. in-situ audiometry

I had a discussion with my acoustician. I wanted to have a real ear measurement and she said that the Signia 7x can do an Insitogram via software. Are the 2 techniques compareable? Theoretically, the structure of the ear is also taken into account with the Insitogram via the hearing aids.