For a neater post, you can detect on a rudimentary level anything in my satchel, the basic outline of my pistol, some magical residue all around my body, the spider etc, but nothing internal, and when trying to look any further your technology becomes hazy and indistinct.

I don't know what sort of technology you have to stop me from detecting you, my character can see magical energy and has excellent normal vision, so you can decide what he can and can't detect off the bat. 

If you intend to detect me though, you can't escape my notice.