Graph a second data range

When two readings that are taken within different ranges are included on the same graph, they may be represented nearly as straight lines, although within their ranges there is variation.

For example:

• Reading 1 is always in the ranges of 210 to 250.

• Reading 2 is always in the ranges of -20 to 10.

With both these readings on the graph, the range will adjust automatically to include values between -5 and 220, which will not show enough detail; both historical readings will look more or less like straight lines.

To solve this problem, check the "alt axis" box for one of the Readings. This will put a second vertical axis on the right, and move that Reading to that axis.