The power source looks like a particularly bulky power tool battery. The whole scanner can be held in one hand, but it's heavy enough that the hand would get tired eventually.
"I haven't got the first idea where to find thorium," she says. "Anything else I should know before I nip off and get some metal?"
"This... isn't the best-traveled highway but it's pretty unlikely you can sit here all day without attention, even assuming no one noticed you crash."
She gets back in her car, continues to Port Angeles, calls the fire department, kills the witch, stops by the mall and briefly borrows a heavy silver necklace and a titanium glasses frame and then puts them back, and then drives to where she found the crashed ship. If he's not there, she continues to the suggested out-of-the-way area.
These aren't the Forks police; they're probably from Port Angeles. She has no pull with them. She moves along, to the other location.
That seems only fair. She comes to a stop and ambles shipward.
"Yup. I have them socked away safely. The process by which I'll get them back will constitute part of my evidence for the end of the world, incidentally."
"I have magic powers," she explains, reaching into the shield, which opens to admit her hand. She pulls out a necklace, and then another one just like it.
He sighs. "'Magic' is not unique to this dimension. I have seen inexplicable abilities before, though not this exact type. Did that shield materialize objects out of nothing? Is it a [wormhole/portal/pocket dimension]? But the fact that magic exists here at all makes me much more ready to believe you about the end of the world. Most dimensions with magic are a lot more... Volatile. I still want the full explanation, please."
"Yeah, you'll get the whole explanation, but materials first. Say when," she says, producing another necklace and a set of the glasses frames and then alternating.
"I really don't. I'm the only person who can use it and it only works on things yea big and I have to literally reach into it every time. I could keep a handful of people in extremely samey comfort without any furniture, I guess, but it is not a post-scarcity machine."
"Still, this is great. No wonder you didn't seem worried about how much silver I wanted. A deal is a deal, so I'll still give you all the tech you wanted even if I was a bit decieved. I'll invent you some things and let you keep some more tech if you duplicate a few other things for me in addition to the metal. Would you like to see the inside of my ship? If you produce these things directly into the metal-purifier you'll be done faster."
"I'd still like the whole end-of-the-world story, if you don't mind."