What's the meaning of scale_factor in OLCI EFR land product?

I found the “scale_factor” attributes in OLCI Level1-B EFR products( the “add offset” is 0). However, when I open the data in SNAP, it seems already to be the float type.
And when I open it in MATLAB by using ‘ncread’ function without multiplying this factor, I can get the same order of magnitude as in SNAP. And when I apply this factor, it seems to be much smaller than the data in SNAP. So, what the meaning of this factor



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I found the reason for MATLAB “ncread” multiplying the factor automatically.