I wanted to get inspector from the source (Nvidias' official site) but they were not making it available anymore as no search results were rendered upon a request. But Guru3d is a trusted site. I just don't know if the software is workable with the new drivers and cards anymore. so at your own risk unless you have an older card and driver ver.
Guru3d has them here. http://www.guru3d.com/files_get/nvidia_inspector_download,1.html