katsumadai was reported to contain nootkatone, yakuchinone, kaempferide, tectochrysin, apigenin-4,7-dimethylether, chrysin, oxyphyllacinol, izalpinin, steroid and their glycosides, and volatile oils (Qing et al., 2012)
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That means: a 50 unit syringe should say its a .5 (or 1/2) of a cc/ml a 30 unit syringe should say its a .3 (or 1/3) of a cc/ml Even though the barrel of the 30 unit syringe looks smaller/thinner than say the 50 unit or 100 unit syringe, or has different hashmarks, it doesnt matter, just remember if your syringe says one of the above, you can use this tutorial
References 1 Hatch-McChesneyALiebermanHR