You can take an old Android tablet and use it as a monitor, and it's surprisingly easy.

Hook up an Android tablet to your computer as an easy alternative to buying a second screen, with this handy guide.

While it may take a little bit of work, you can use your Android device as an additional monitor for your Windows PC. Here's how to do just that.

But you can use your tablet to improve your productivity, too. Since a tablet is essentially a portable touchscreen, why not repurpose it during work hours as a secondary display?

Whichever app you try, using your iPad or Android tablet to extend your screen might boost your productivity. Or, of course, you could use the tablet on its own as a productivity-boosting tool.