Final answer:
The best unit of measurement to estimate the volume of a juice box is milliliter (ml).
Step-by-step explanation:
The best unit of measurement to estimate the volume of a juice box is milliliter (ml). An eyedropper holds about 1 milliliter and a juice box holds about 25 centiliters. Since milliliter is a smaller unit of volume, it would provide a more precise estimation for the volume of a juice box.