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The kilogramme.
Gram.
The answer will depend on what aspect of the calculator you wish to measure: its length, volume, mass, weight, temperature, etc.
A kilogram (kg) is a measure of mass in the Metric system.
I would use a postage scale or a laboratory balance to derive the mass of the card.Once I knew the mass, if I had to write it down, remember it, or tell other peopleabout it, it would undoubtedly be most convenient to express it in grams .