Meek - you are asking the million dollar question, one I have been wrestling with for a while now.
We need other folks with this pen to measure and verify the amount that they are getting from this pen. When I transferred my pen to an empty vial, and then drew it into a slin pin, looked like I had about 40 units. If that is correct, then one unit on a slin pin should contain 162.5 iu. Adjust from there - about 1 and 2/3 units???
Keep in mind, this pen is intended as a 1 time use item, not intended to be used by bodybuilders. So yes, it contains 6500iu in .5 ml, which again, is not most convenient for our application.
@bickel29 I will be transfering mine in the next week or so. Let me know what you want to see and I'll do my best to help solve this. I just got in some half cc insulin syringes so if I pull it from the pin with that and fills all the way up it'll be exactly a half cc.