There are two types of tonnes, with a slightly different mass. A ton is equal to 2000 pounds. Another type of ton (sometimes called "metric ton" to clarify) is equal to 1000 kilograms.
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It is a customary unit.
The pound is NOT a metric unit.
it is a customary unit
I'm guessing by customary, you mean imperial. if so inches are customary/imperial
The customary unit would be miles (mi), and the metric unit would be kilometers (km).