To create measurement annotations in WebViewer, click the Measure button in the top header, then select one of the measurement tools. Next use the selected tool to create a measurement annotation on the document. An overlay with scale and measurement information will show up when you are creating or selecting a measurement annotation.
If there's no scale created before, the Scale modal will pop up when clicking on the document. Click the Create button to create a new scale. This initial scale will be applied to all the measurement tools.
The following example shows how you can determine if an annotation is a measurement annotation, and logs the scale and precision of it after it's added:
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