Any portable DVD player with Video In jack?

Do any of you of a portable DVD player with a video in jack like s-video or composite video? I'd like to use one as an external monitor FROM an ultrasound machine. I know, weird question but I'm going up to altitude to study trekkers and am scrambling to find one since the main units display is down. THanks very much. Dave. Do most laptops have a VIDEO IN and AUDIO IN jack(s)?