I would imagine the Ritter PSP would be generally okay to have on you. It's not like they're going to find the scalpel blade. They'll probably glance it over and then hand it back to you.
I've flown both domestic and overseas flights with a PSK (with the scapel blades) and never been questioned. I've also been thru many an x-ray machine at govt. buildings and, again, never been hassled.
I usually carry a LED flashlight, a small set of tools, a Ham HT radio, home built FAK, couple of Millenium bars, water bottle or hydration bag, some paracord, digital camera and usually a notebook PC and broadband card. Knives I usually leave behind as I don't normally check luggage.