Last vaild update time

[smartroad]

I was just thinking, sometimes the sensor doesn't update and was wondering if it would be worth having a display that says when it last got valid data? It's just that I have sometimes noticed that the display hasn't updated even though I know (using another thermometer) that the temp has changed.

It might only need to show this is it hasn't didn't get a valid data signal say the last n attempts (could be changed in settings?)