In order to find the level of a mod, use the wiki.

For example, for this mod go to http://wiki.projectgorgon.com/wiki/P...easure_Effects (or go to the Psychology page and expand the Treasure Effects table, but don't go to the 'By Slot' or 'By Ability' pages -- those don't have level info).

Next, find the treasure effect you are after. In this case use the search function on your browser to search for "Postive Attitude boosts" for example, to find the mod "Positive Attitude boosts your Out-of-Combat Sprint Speed by 4 for 60 seconds". This will show only the max-level mod (here level 30), and the option to Expand on the right which will show lower level, lower magnitude mods as well (in this particular case there is only one version of the mod, but in most cases various versions with different levels will be listed).