Conversation

What would be a good base tool for a sonic screwdriver or tricorder, as a literal high-tech computer-based multi-tool, built around an arduino or RPi? I mean the way a knife is the base for a Swiss Army knife or pliers for a leatherman? Actual screwdriver? Thermometer? Tweeter?
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For all those suggesting a smartphone... that’s not the base tool so much as the base compute+comms backend. More handle than business-end. Looking for sensor/actuator type suggestions. Or specialist comms /compute like R2D2 socket probe or a lock-pick/code-break thing.
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Programmable multi-color blinker Morse-code beeper USB connector with some sort of data airlock Directional microphone Radio jammer Focused emp weapon to disable small electronics Artificial nose Mass spectrometer? Soldering iron OCR-to-audio Pepper spray Hot glue gun