Our needles start with 10, 20,30 up to 100. In other words they go by 10’s and each hash mark between go by 2’s. Example: Between 10 and 20 there are 4 other marks. 10 12 14 16 18 20. Very difficult to see where or 15 would be! My son will be doing it and from what I read men do better on 200 so at least he can use them easier then me! Just thought I’d let you know there are other types out there. Thanks for your blog. It’s been very helpful. We are not newbies to hcg but we were mixing 30ml to 5000 and doing 50 unit shots.