Good morning.
The sekonic software and light meter are a terrific package; however, the profile creator section makes very conservative assumptions about clipping points, dynamic range, and mid-tone settings..If you use the profile, take a shot where the meter shows clipping and then see what it actually looks like in your post--processing. If you see detail, then you can can adjust the profile. The software has an edit function that lets you move the points and dynamic rage out or in...I have tuned my profiles over the years and every time the sekonic software was conservative and I moved them out.
The other poster's point is valid, however, you will not necessarily find the same dynamic range in practice as the lab tests indicate.
Last point, the software will take TIFF files; you are not limited to JPEG. I use TIFF from RAW files to approximate the cameras actual characteristics as closely as possible when building profiles.
Best Regards,
George Pappas