I have a 27" NEC monitor to give away. It can hardware calibrate, this means you plug it in via usb and it can set its colours internally using a colour probe such as an x-rite eye-1. This is handy if you do any colour proofing for print.
It has a slight issue where it flickers occasionally, which is partly why I’m not keeping it despite it being an expensive piece of kit.
This hasn’t been that much more than a mild bother while working, but i think it might just have a loose connection in it somewhere if any electronics people feel like having a look at it.
Also have a 21" dell monitor to give. It’s one of those old 4:3 ones which tend to be quite good.