Amprobe IR-750 Infrared-Thermometer - Manual (Page 30)

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Zoom In Selected Graph
To enlarge the particular part of the graph, use the mouse pointer to select area
from upper-left point to lower-right point.
You can use button to save the selected enlarged graph.
To resume to its original full view, use the mouse pointer to select any area on
the graph from lower-right point to upper-left point.