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This came to mind from reading "Combined line trimmer
and metal detector." Metal detectors are manually
operated, for treasure hunting and possibly for finding
landmines (older ones that contain metal). A low-flying
drone with a metal detector could scan an area, and record
and/or send data
on where metal is found.
[kdf, Sep 15 2020]
||Music would be preferable to a steady drone, shirley.
||Combined metal detector and bagpipes ?
||The horror ... the horror ...
||You could have the "detection" sound instead vary the note
of the bagpipe drones (changing the length?), so your tune
rises as you approach metal.