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HANDHELD computers
It is another word for a handheld computer
Personal Digital Assistant
Yes, Sony does make handheld digital camcorders. They cost, on average, $200 and are great for any moment. If you need a top quality camcorder for the right price, this is it.
A handheld digital & optical microscope generally (Celestron model) costs around $100. You can get them online at these stores-Smarter.com. (http://www.smarter.com/microscopes/celestron-44306-handheld-digital-/pd--ch-6--pi-420256.html);Opticsplanet.net (http://www.opticsplanet.net/celestron-handheld-digital-optical-microscope.html)
Handheld camcorders range in price from two hundred to thousands of dollars. It all depends what capability's you desire the camcorder to have such as digital, 3d and many more things.
mouse
No such thing. Some will cover frequencies and systems not use in your area, making them a wastre of money - even though their coverage may be the "best." Some are simple to operate, some are very difficult, so the "best" will be determined by your experience and expertise at operating such devices. The Uniden Bearcat BCD396XT provides the most coverage, including trunking systems and digital systems, but it may or may not be the "best" for your area or needs.
There are many cheap handheld televisions on the market. One of the cheapest is the Digital Prisim model that is around $30. Most phones now also will show television shows.
personal digital assistants (PDA)
A smartphone would be one example of a small handheld device. Another might be a calculator, thermometer, or a whistle.