Hey all I have a 10mg 30iu pharm grade pens. The pens are numbered 1,2,3,4 when you click them. What are those numbed for? Some say these are representative of the number of iu for the newer pens, meaning 4 of these clicks would be 4iu, others say that 20 clicks is 4 iu. Any help is appreciated so I don't accidentally inject 10 iu.

Info online is not clear on this
Thanks.