Hey! Thanks for checking it out!
The first two tools just work by waving them over the part, and seeing if any of the parts react differently from the other three.
If you feel like giving it another try, here's a couple tips based on what I noticed during play testing (I consider these gameplay spoilers btw, in case someone is reading the comments before playing):-Not every tool will show a difference on every set of parts. If a tool seems like it's giving identical readings on a set, it probably is!
-It's better to use one tool at a time across all four parts, than to use all three tools before moving on to the next part. That way, it's easier to notice if one of the parts is giving off a different reading, because the other readings will be fresh in your mind.
-The difficulty does increase with each round, it's possible that the difference in the last round could be subtle, so you'll have to pay close attention.
Again, thanks for playing and thanks for the feedback!