Eileen
I thought there might be an easy solution using the Preflight Panel. This would seem to be the natural option. However a brief perusal of said panel made me think again.
What do you mean by “images and objects”? Because ”scale’ is a variable thing and whether something is 100% depends on the object.
If you know all of your images are 300dpi and you want them to all be used at 100%. In the Preflight Panel, you could set both the Image resolution maximum and minimum to 300 dpi. This way if one was slightly too large or too small you would get a preflight warning. You could also set the Non-proportional Scaling of Placed Objects alert to “on”. This won’t make much difference, but it would alert you to an image that is non proportionally scaled!
There are no settings in the Preflight Panel that will alert you to text which not exactly to spec, except you can limit the Minimum text size.
Vector based objects? I think you are out of luck from a Preflight Panel perspective. . .
This seems like something a script could be written to do, but you would have to clarify more completely what you mean by images and objects. (InDesign objects? imported eps files? text?). You could then post a request in the scripting forum and hope that a talented scripter (scriptor?) wants a distraction from the more complicated problem they should be working on, and they will write you a script!