"Well, magnets, most obviously, but if you hand me any piece of metal that could be magnetized, like iron or steel, I can use Prestidigitation to induce a magnet field in that, and then maybe you can see if that's just as easy for you or if it's somehow taking advantage of my knowledge of magnetism. Prestidigitation can't produce acids, according to you, but according to my best guess as to what Prestidigitation does, it should definitely be able to shift acidity, and that may have to do with my knowledge of what acidity is rather than it being a mystical property of liquids to destroy things."
"And definitely real mice, unless summoned mice can get pregnant, the whole point is to see what works to stop mouse pregnancies. We'll also need an expert on mouse anatomy to help me trace out where the mouse analogue to the human male epididymis is, and now that I think about it, that could easily require the ability - make images bigger, so you can examine them better. And also for mice we need to focus down the Prestidigitation even smaller than it would have to go in humans, which brings up the question of how good magic is at focusing forces down to tiny targets - including via spellsilver-stabilized magic items if that helps."