Metric and standard tools are distinguished by the fact that metric tools utilise metric measurements whereas standard tools use imperial measurements. In both measurements, several current tools are accessible.
Standard or SAE tools are terms used to describe standard American equivalent tools. All measures and sizes are in inches in this system, which is based on imperial measurements.
Metric tools, as the name implies, work with the metric system. All measures and sizes are expressed in millimetres or centimetres.
Although there are two distinct techniques for measuring and sizing tools, many products combine the two, making them universal. Many tool manufacturers make tools for a number of countries, avoiding the need to make two sets of tools for the American and worldwide markets. Dual measurements are a suitable compromise because most other countries use the metric system and the United States has been hesitant to adopt metric measurements.
Because some industries primarily employ metric measurements, some tools are only available in metric measurements. This is true, for example, of some automotive industry tools. Metric measurements are also more common in tools made outside of the United States.
Metric tools can be used by those who are unfamiliar with the metric system and do not have access to standard or dual measurement tools. They can simply use a calculator or a conversion table to convert the measures to imperial.