I have a little dosing cup here by the computer that I keep my vitamins in - and M&Ms, lol - it’s the little cup size you sometimes get with OTC cough syrup, except this is calibrated, from the medical supply store.
(Believe it or not, I used them by the sleevefuls for making miniature things.)
Anyway, the whole dosing cup is 1 fl. oz. or 30ml or 8 drams or 2 Tbsp.