# Open/Close

The Open/Close Tool is used when measuring a closed shape and the start and finish points do not accurately align. Instead of physically adjusting the final point, Moasure estimates the closure based on previous movement data.

**When to Use the Open/Close Tool:**

* Obstructed Areas: If a physical barrier (e.g. water or a wall) prevents reaching the final point.
* Hazardous Terrain: When reaching the last point poses a safety risk (e.g., steep slopes, construction zones).
* Closed Shapes: When measuring a closed shape (e.g. a perimeter or boundary) and the start and finish points are slightly misaligned.

**Accuracy Considerations for the Open/Close Tool:**

* Using the Close tool introduces an estimated position, which may result in a higher margin of error compared to capturing the final point directly.
* For best accuracy, always aim to physically reach the final measurement point whenever possible.

**Using the Open/Close Tool:**

1. Tap on Edit.
2. Tap on Open/Close to toggle between closing and opening the measurement.

For best accuracy, Moasure recommends only using the Open/Close Tool when necessary and ensuring measurements are as complete as possible.

**When to Avoid:**

* If an accurate, complete measurement is required.
* If you can physically move to the final point without issues.
* When working with measurements that require minimal error.

The GIF below shows an example of when **not** to use the Close tool — the [start/finish error](/en/moasure-app/understand-measurement-types.md#closed-shape) on this closed shape is 2.0%, which is high enough that we’d recommend starting the measurement again, unless absolute accuracy isn’t important for your project.

<figure><img src="/files/ARsswNOHYNUIJH9nuNSl" alt="" width="375"><figcaption></figcaption></figure>


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