THE DELL C1422H is our pick for the best monitor under $350, as it’s ideal for quickly adding a second screen to your MacBook. The 14–inch screen size is certainly small, but it means this monitor can be carried around with you, and as it’s powered by the same USB–C cable it connects to your MacBook with, it means it’s quick and easy to set up, no matter where you are. In these days of hybrid working, this is a great tool that will keep you productive.