> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/uwp/measurement/measurement-a.md).

# Adding measurement tools to viewer in UWP

Measure Distance, Perimeter, and Area accurately with our tools. Set scale for precise measurements in PDFs. Customize units and get instant feedback. The Apryse uwp SDK streamlines secure document pr

There are three measurement tools:

* Distance: [RulerCreate](https://sdk.apryse.com/api/uwp/tools/api/pdftron.PDF.Tools.RulerCreate.html)
* Perimeter: [PerimeterMeasureCreate](https://sdk.apryse.com/api/uwp/tools/api/pdftron.PDF.Tools.PerimeterMeasureCreate.html)
* Area: [AreaMeasureCreate](https://sdk.apryse.com/api/uwp/tools/api/pdftron.PDF.Tools.AreaMeasureCreate.html)

## Calibration

The Calibrate menu option for measurement annotations allows you to determine a PDF's scale, enabling accurate measurements.

![](https://3246663708-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Frgmys2szYV2Z567Zu3vi%2Fuploads%2Fgit-blob-997f97782251eb6277aac2a5f208cc4a4470c184%2F393d07378f8c12c38af7a5963c481af3e2c9af80-1274x752.gif?alt=media)

## Perimeter/Area Measurement Tool

These tools can be used to measure the length of a perimeter or the area of the user's selection. Measurements can be viewed in mm, cm, m, km, in, ft, mi, yd, and pt. The tools also come with a customizable scale that allows measurements of various precisions. Once users have created their annotation, they are then able to freely edit the selection and recieve instant feedback on the current measurement information.

![](https://3246663708-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Frgmys2szYV2Z567Zu3vi%2Fuploads%2Fgit-blob-9bc6e78acfc3a21a3eff64ff8c9524f5b3bc3b7f%2F6c1c8c8e7a5bf25bb451f7b26e54b3d8e0f0449d-1274x752.gif?alt=media)

![](https://3246663708-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Frgmys2szYV2Z567Zu3vi%2Fuploads%2Fgit-blob-4211d983a7609360f14bff0edaade8d21cac094d%2F6b68f2a1c287ce187b5bcae9ca30fc34bfa0786d-1274x752.gif?alt=media)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.apryse.com/uwp/measurement/measurement-a.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.