Metrication: Exceptions

As of 2015, the metric system officially predominates in most countries of the world; some traditional units, however, are still used in many places in specific industries. For example: Photo and video cameras are standardized to mount to tripods using 1/4-20 and 3/8-16 screws, which are dimensioned in inches, as per ISO 1222:2010, Automobile tyre pressure is commonly measured in units of psi in several countries including Brazil, Peru, Argentina, Australia, and Chile, the UK and the US. Automotive engine power is usually measured in horsepower (rather than in kilowatts) in Russia, most other ex-USSR countries and German-speaking countries (note that this is typically "metric horsepower" rather than imperial horsepower), although in the EU from 2010 the horsepower is permitted only as a supplementary unit. In Hong Kong, traditional Chinese and British imperial units are normally used instead of metric units in particular types of trade.

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