In the production process, the density of sodium dichromate dihydrate crystals needed to be measured, and an imported nuclear density meter was previously used; however, the equipment required regular maintenance, annual inspections by regulatory authorities such as the emergency management and public security departments, and certified personnel for servicing. Goldcard’s subsidiary Tancy provides a mass flowmeter capable of directly measuring the mass flow, density, and temperature of the medium, enabling accurate measurement of sodium dichromate dihydrate crystal density while simultaneously providing mass flow data; this solution replaces traditional nuclear density meters, completely eliminates radiation risks, simplifies production management processes, and has gained strong customer recognition.