That’s how many pixels will be in the output image. You can verify it via the EXIF data. Of greater importance to you is to learn how to work all of the camera controls in the field, especially focus, range, span. It will also be useful for you to know your SSR (spot size ratio) so that you know how close you need to get to an object to be able to get an accurate reading. You should also spend some time with the software to learn how to thermally tune and optimize your images. Become familiar with how sensitive the imager is and how to control conditions to optimize your ability to find things.