An otoscope (ear inspection instrument) is an excellent tool for inspecting small parts, cabinet flaws, faint markings, solder connections, peeking inside a tube, etc. I bought an lower end model on ebay and have been very happy with it.
Otoscopes have a built in light and moderate magnification, giving a bright focused image. Dozens can be found on ebay, in a wide price range. Mine cost $30, uses 2 C cells, and came with an assortment of viewing tips. It has been a great help and I use it regularly.