Please How to view the Spatial resolution of the pixel in SNAP ? I’m a new Snap user.
generally, this information is written somewhere in the metadata, but its exact location depends on the data you are using?
What product are you working with?
I use Sentinel 2 L2A which I obtained after correction of Sentinel L1C
This page describes the spatial resolution of each band
https://earth.esa.int/web/sentinel/user-guides/sentinel-2-msi/resolutions/spatial
http://www.gdal.org/frmt_sentinel2.html
I am currently not on a computer with S2 images, but there should be also the metadata information on each band somewhere. You can search the metadata for names and values by right-clicking on it.
Edit:
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Thank you very much Your help is very precious.
Another place, more general, but also not always available is the Geo-coding information window. Only for projected scenes.
At Analysis -> Geo-Coding or the Phi-Lambda 
icon in the menu bar.
Or you can measure it. Zoom in into the image that you have big pixels and then use the Range Finder Tool 
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one question, you choose [elt_0_0,10], so why you did not chose [elt_0_2 or [elt_1_1 or others?
Thanks in advance.
The elt__ values are values of the matrix of the affine transformation which defines the UTM projection in this case.
elt_0_0 is the scaling in x direction and elt_1_1 tis the scaling in y direction.
You can check this wikipedia article: https://en.wikipedia.org/wiki/Affine_transformation#Image_transformation
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