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A micrometer is a measurement device incorporating a calibrated screw used widely for precise measurement of small distances in mechanical engineering and machining as well as most mechanical trades. The first micrometer was developed by Jean Laurent Palmer of Paris in 1848.
We assume you are converting between nanogram/microliter and microgram/milliliter. You can view more details on each measurement unit: nanograms/microliter or micrograms/ml. The SI derived unit for density is the kilogram/cubic meter. 1 kilogram/cubic meter is equal to 1000 nanograms/microliter, or 1000 micrograms/ml.