This is one part out of ten equal parts. (See: [[rc://en/ta/man/translate/translate-fraction]])
# a tenth of an ephah
This can be written in modern measurements. AT: "a tenth of an ephah (which is about 2 liters)" or "2 liters" (See: [[rc://en/ta/man/translate/translate-bvolume]])
A "reminder" is something that shows evidence that something had occurred that required justice. In this case, he made the offering to determine whether his wife had committed adultery or not.