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Any EEs here should check out iCircuit. It's a real-time graphical SPICE-like circuit simulator. It's available for pretty much every platform.
This would have been nice to have in college!
I came across some very good apps, just his morning looking through Control Engineering magazine.
They have a few test instruments, the one I was interesting in is the decibel one. And can send saved data and calibration on it.
Called Decibel 10th
Link:
https://itunes.apple.com/us/app/decibel-10th/id448155923
It may not go high enough but it also has recording on it.