Reddit reviews Ultra Slim 0.21 inch Dia. Probe USB Endoscope with Semi Rigid Cable USB Type C Adapter Borescope Waterproof Inspection Camera Snake Camera for PC Notebook and Android Device(5M/16.4ft Cable)
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One like this: https://www.amazon.com/gp/product/B01IGPDMK0/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Just a tiny little camera with lights on the end that you can connect to your phone/tablet/computer. You can get a decent one for around $20.