If you want to calculate device value you have to fill "Formula" field, ie:
%value%*1
which of course returns value multiplied by 1 ;-).
In my case I had to calculate voltage measured by 1:2 divider and 1:3.3 divider, so my formula was:
%value%/1024*3.3*2
the value is divided by 1024 because ADC has 10 bit resolution.
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