# How to find a default colorbar unit or calibrate in mm

**URL:** <https://discourse.slicer.org/t/how-to-find-a-default-colorbar-unit-or-calibrate-in-mm/22501>\
**Category:** SlicerCMF\
**Created:** [March 14, 2022, 4:19pm UTC](https://discourse.slicer.org/t/how-to-find-a-default-colorbar-unit-or-calibrate-in-mm/22501 "2022-03-14T16:19:57Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [March 15, 2022, 3:09am UTC](https://discourse.slicer.org/t/how-to-find-a-default-colorbar-unit-or-calibrate-in-mm/22501/6 "2022-03-15T03:09:04Z")

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By default the color legend is set to the data range, so if it is set to -5 to 0.9 then it means that the maximum distance found was 5mm. Note that closest distance measurement is not symmetric, so if you get an unexpected result it might be due to that you switched up the source and target models.

Make sure you use the latest Slicer Preview Release. It should look something like this:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/3/a3e28f08694e7a51b9da5d5c2b2039615dd16bc2.png)

If you want to change the displayed range then change `Data scalar range (auto)` to `Manual` and set the range that you prefer.

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_[View the full topic](https://discourse.slicer.org/t/how-to-find-a-default-colorbar-unit-or-calibrate-in-mm/22501)._