en_tn/num/05/15.md

a tenth

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 grain offering of jealousy

"a grain offering for jealousy"

indicator of sin

An "indicator" is something that shows evidence of something. In this case, he made the offering to determine whether his wife had committed adultery or not.