Half a croissant, on a plate, with a sign in front of it saying '50c'
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Drone with Metal Detector

Drone flies close to ground in a scanning pattern, records metal detector data
  [vote for,

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.
benbradley, Sep 15 2020


       Music would be preferable to a steady drone, shirley.
whatrock, Sep 15 2020

       Combined metal detector and bagpipes ?   

       The horror ... the horror ...
8th of 7, Sep 15 2020

       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.
neutrinos_shadow, Sep 15 2020


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