These aren't the height of technology. Basically a mirror on a ball joint at the end of a telescopic pole. But I've used one to good effect. It lets you look into places you can't easily stick your head. Mine has a built in LED illuminator. I wonder how I ever did without one.

Housolution Magnetic Telescoping Pick-up Tool Kit, 5pcs Pickup Tool Set with Retractable Handle, 1&15lbs Magnetic Pickup Rod, 360° Adjustable Round & Square...
5.0