Restech Dx-pH Measurement System, Инструкция по эксплуатации

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Enlarge a portion of the graph with respect to a chosen point.
Reduce the size of the graph with respect to a chosen point.
c. The button on the right to grab the graph at any point and drag it
up, down, to the left or the right.
3. The button is for scrolling in fine increments to view pH changes with
precision along the X or Y axis. Note that to use it along the Y axis, the “Y” Scale
must be unlocked.
The two graphs below illustrate this function. The graph on the right is an expanded
version of the graph on the left; the cursor is on the same point in each graph. The
information that is displayed is the same.