When charging by weight, which instrument measures the amount added?

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Charging by weight relies on tracking the actual mass of refrigerant being added. A calibrated scale provides a precise measurement of how much refrigerant has been introduced, typically by weighing the cylinder as it dispenses. The other instruments don’t measure added quantity: a pressure gauge shows system pressure, which varies with operation rather than amount added; a thermometer reads temperature; a hygrometer measures humidity. Weighing the refrigerant ensures you reach the exact target charge according to specifications, independent of tank temperature or system operating conditions.