# Probe Pane

This page provides information on the Probe pane, which can be accessed under the *Tools* tab or by clicking on the [![Toolbar Probe 30.png](https://v30.wiki.optitrack.com/images/f/f7/Toolbar_Probe_30.png)](https://v30.wiki.optitrack.com/index.php?title=File:Toolbar_Probe_30.png) icon from the toolbar.

## Overview

This section highlights what's in the Probe pane. For detailed instructions on how to use the Probe pane to collect measurement samples, read through [Measurement Probe Kit Guide](https://docs.optitrack.com/v3.0/motive/measurement-probe-kit-guide).

#### **Probe Calibration**

The *Probe Calibration* feature under the Rigid Body edit options can be used to re-calibrate a pivot point of a measurement probe or a custom Rigid Body. This step is also completed as one of the calibration steps when first creating a measurement probe, but you can re-calibrate it under the *Modify tab*.

#### **Steps**

1. In Motive, select the Rigid Body or a measurement probe.
2. Bring out the probe into the tracking volume where all of its markers are well-tracked.
3. Place and fit the tip of the probe in one of the slots on the provided calibration block.
4. Click *Start*
5. Once it starts collecting the samples, slowly move the probe in a circular pattern while keeping the tip fitted in the slot; making a cone shape overall. Gently rotate the probe to collect additional samples.
6. When sufficient samples are collected, the mean error of the calibrated pivot point will be displayed.
7. Click *Apply* to use the calibrated definition or click *Cancel* to calibrate again.

#### **Digitized Points**

The Digitized Points section is used for collecting sample coordinates using the probe. You can select which Rigid Body to use from the drop-down menu and set the number of frames used to collect the sample. Clicking on the *Sample* button will trigger Motive to collect a sample point and save it into the `C:\Users\[Current User]\Documents\OptiTrack\measurements.csv` file.

When needed, export the measurements of the accumulated digitized points into a separate CSV file, and/or clear the existing samples to start a new set of measurements

#### **Live Position**

Shows the live X/Y/Z position of the calibrated probe tip.

#### **Last Point**

Shows the live X/Y/Z position of the last sampled point.

#### **Live Distance**

Shows the distance between the last point and the live position of the probe tip.

#### **Distance**

Shows the distance between the last two collected samples.

#### **Angle**

Shows the angle between the last three collected samples

![Probe pane showing the measurements.](https://2498944597-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F5yEhrhQepNQfhsDzAh6n%2Fuploads%2Fgit-blob-8d715874c8be2395e521c829b2bbbeda075b492b%2Fimage.png?alt=media)