Tycon Power Systems TP2700WC Operation Manual page 47

On this page, you can see the history data plotted in graph format
for easier observation. If you want to see more detail, just use
your mouse to select the area you want and the display will zoom
to that area.
Note: The software won't show your mouse movements as a box
but it will accept your drawn invisible box and zoom the display. To
go back to original just draw a straight invisible line on the display
with your mouse.
8000040 Rev 3
47