Units are created in the Unit of Measure Converter tool within COMPASS. Go to Tools/Unit Converter or can open it directly within the Windows applications list.
Use the Options menu to create a new unit as demonstrated below to create a new unit for "slm@25C" ...
Create new unit at right side using the blank piece of paper icon:
Select the base unit next:
Then simply change the "Reference Temperature" below to new temperature component and the unit will auto name itself at the top and can Save this new unit for use in COMPASS.
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The new unit will now also appear in any menu where unit selection is needed with COMPASS setups.