In order to be able to do visual inspections of PCB’s or components I normally use a magnifier glass. Where the magnifier glass offers a magnification of 5X, a low-cost USB microscope can give you 20..500X.
The USB microscope I ordered for about 15 euro gives interesting results. It contains 8 white LEDs that illuminate the object to be investigated from above. The focus range and magnification can be adjusted. LED Light intensity can be changed. It really turned out to be a plug-and-play device. Plug in the USB connector, install the software and enjoy the pictures (and even moving images). Great fun.
USB Microscope set-up and PCB:
5 cents Euro coin
30 pF capacitor
Off-topic; tulip fields, April 2017, 100 meters from our backyard
Flypast of Beechcraft D18S and a Harvard April 22, 2017 in Stad aan ‘t Haringvliet as a contribute to the Irish pilot Thomas Noble Forster who crashed, at the age of 21, in het Haringvliet April 1943.