How can you have an imperfect unit. You cannot have an imperfect meter and hope to measure a meter, you cannot measure anything with an imperfect unit, you have admitted that it is not a unit/standard anymore. You cannot measure the value of something with an imperfect unit of measure, it is a contradiction period.
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I can measure things in pesos and dollars. I do it all the time. I literally do it every day, so I'm not sure how you can tell me that I can't.
That's fine if you say it's not a standard, because a standard implies that it will be consistent over time. But it is a measurement.