We can test blotters and microdots here btw.
"Kenwood, icy drops" liquid bottles (3.2 ml), light blue label, contain presicely 125 ug per drip. So I usually compare other forms with those. Often a reasonable indication I'd say. My best trips were from blotters anyway, but generally blotters contain the weakest strength in my experience. Microdots were always good for a very decent trip, never been dissapointed by just taking 1.