I'm almost always interested in the actual values of things when debugging a part our systems at work. I need to know that the generator exceeded 3kW, or the P

I'm almost always interested in the actual values of things when debugging a part our systems at work. I need to know that the generator exceeded 3kW, or the PDF of the voltage was above 4V, or things went hay-wire at 11:31AM. It is easier to tell at a glance what's happening on a plot if there is a grid.