Instead of relying on the manufacturer’s listing, we measured each monitor’s contrast ratio during our testing. Contrast ratio: A good contrast ratio makes the dark areas of a screen easier to see when you’re watching a movie or playing a game.Great monitors should also include a USB 3.0 hub so you can connect peripherals such as keyboards, mice, and webcams, as modern laptops come with fewer and fewer ports of their own. Ports: Since most computers have either an HDMI port or a DisplayPort connection, having both is a requirement for any good monitor, and the best models also include a USB-C port that can receive a display signal and charge a connected laptop at the same time.

For most people, QHD monitors offer the best combination of detail, usable desktop space, and price. And 4K monitors, while excellent for photo or video work, are more expensive-this is part of the reason we have a separate guide for them.

For a 27-inch monitor, 1080p is too low a resolution-text and images are likely to be visibly pixelated or blocky.

Resolution: The three most common monitor resolutions that we test across all our guides are 1080p, or 1920×1080 Quad HD/QHD, or 2560×1440 and 4K, or 3840×2160.

Display technology: We test only those monitors that use IPS display panels, not TN (or VA) technology, because IPS panels provide far better viewing angles and color reproduction.

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