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@epinephrine,
You can format the x and y-values being shown in toolTip by setting the xValueFormatString and yValueFormatString respectively, as per your requirement.
If you are still facing the issue, kindly create a JSFiddle reproducing the issue you are facing and share it with us so that we can look into the code, understand the scenario better and help you out.
— Shashi Ranjan Team CanvasJS