Film sets can be quite dangerous environments. For people who are not used to being on sets (believe it or not, those people do exist!), all the technology on a full-blown commercial set can be quite overwhelming at best, and hazardous at worst.
Typically, when I have a client on set, we build them a little video village which gives them a chance to see what we are shooting on a dedicated client monitor. I do this in a small way even if the budget is tight (which is becoming the norm these days).
Radian MC wireless video transmitter on top of the camera on a recent corporate shoot.