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