My favorite lightweight 15.6-inch KYY K3-1 portable monitor gives your laptop a second 1080p screen at an absolutely budget price for Prime Day

(Image credit: Future)

Adding a second screen to your laptop doesn't mean sacrificing the device's portability. The KYY K3-1 (a revised version of the K3), weighs just 1.7 pounds and measures around 0.35 inches thick, making it compact enough to slip into a bag when you're traveling or working away.

• Best for: Laptop owners who want extra screen space when traveling, as well as anyone looking for a portable display for compatible consoles or smartphones.

• The deal: The…