noun
surveillance monitor
A display screen used for monitoring security cameras or other surveillance feeds.
警備員は監視モニターで駐車場の様子を確認した。
The security guard checked the parking lot on the surveillance monitor.
監視カメラ is the camera itself, while 監視モニター is the screen that displays the camera's feed.
Compound of 監視 (surveillance) and モニター (monitor), a straightforward modern technical term.