 Although the metric system is the official of system of weights and measures of the country, both metric and US customary units (similar to or identical with imperial units in many instances) must be used on commodity labels which are exported to the American market.The real estate industry may also tend to cater to most categories of home buyers and likewise may use both metric and imperial standards of measure.Beyond this distances are usually measured in metres or kilometres; mass in milligrams, grams or kilograms; and temperature in degrees Celsius.