metric device
There are many things about a stopwatch that you can measure.You might want to know the mass, weight, diameter, thickness,temperature, conductivity, or cost of the stopwatch, and they allhave different units.Of course, the stopwatch itself measures time, and the unit of THATis the second, in both SI and US Customary units.
It is a customary unit.
The opposing systems are imperial and metric, not customary. But, meters are metric.
The pound is NOT a metric unit.
It is customary.
It can be more or less. An once (customary) is bigger than a gram (metric) but a pound (customary) is smaller than a kilogram (metric).
Metric.
Metric.
Metric
A "gran" is a German measurement, it is neither customary or metric. A "gram" is a metric unit.
customary
It is a customary unit.