Microliters
Microliters are a unit of volume in the metric system used to measure very small amounts of liquid. One microliter is equal to one millionth of a liter. This tiny unit of measurement is often denoted by the symbol μL. To put it into perspective, a single drop of water is roughly equivalent to about 50 microliters.
US gills
A US gill is a unit of volume in the United States used for measuring liquids. One US gill is 1/4 of a US pint or 118.294 milliliters.