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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 a tricorder sort of deal, an SDR or an oscilloscope, or ideally one of the neat ones (red pitaya?) that have the hertz range/resolution to be both simultaneously Antenna design could be an issue, though