I’m not 100% sure if I’m understanding your question correctly. I have these spoons https://www.amazon.ca/gp/aw/d/B0009X1P9S/ref=mp_s_a_1_2?ie=UTF8&qid=1496609423&sr=8-2&pi=AC_SX236_SY340_QL65&keywords=tiny+spoon&dpPl=1&dpID=31azPto8XVL&ref=plSrch
Although they are named drop, pinch, etc., I measured them using a plastic 1/32 spoon and found that from smallest to largest, they are 1/64, 1/32, 1/16, 1/8, 1/4. If you have the same spoons, use those to measure. If you need something like 3/32, you’ll need to do either 3 times 1/32 or 1/16 + 1/32.
