Navigate to your charts using the bottom console; tap Discover > Charts at the top of your screen.
Here tap + Add Chart to add a new Custom Chart
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You can add up to two different unit types (plotted on the left and right y-axes) and up to two different data series.
You can choose two items to plot on a graph, including any combination of biometrics, nutrients and nutrition scores.
Once you have saved your custom chart, you can toggle on or off visibility on your charts page, or even delete the chart altogether.
Learn how to use Custom charts on the web version of Cronometer