Accurate milligram scales can start to get pricy.
So if the amount is not absolutely critical. You could measure out your 1/4 tsp. Dump it out on a flat surface. The easy way would be take a razor blade and divide it in half, than take each half and divide that in half again. That gets you ballpark 1/4 of 1/4tsp. You could achieve the same result measuring 1/8tsp and then dumping it and dividing it in half. Is the amount of nutrient that critical, or can the yeasties benefit from a bit extra?
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