Weight is a measure of the force exerted on a body by gravity. It can be measured in any recognized unit, either metric or old fashioned.
It is a customary unit.
customary
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.
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.
customary is pounds and metric is Newtons; 1 newton = 0.22 pounds