customary
It is a customary unit.
Metric.
A "gran" is a German measurement, it is neither customary or metric. A "gram" is a metric unit.
Fahrenheit is a customary unit
The pound is NOT a metric unit.
customary
It is a customary unit.
I'm guessing by customary, you mean imperial. if so inches are customary/imperial
it is a customary unit
It is the basic unit of time in both systems.
Metric system: meters; customary system: feet
The customary unit would be miles (mi), and the metric unit would be kilometers (km).