How accurate are steel rules when measured in SI units?

Steel rules are precision measuring instruments often used in various fields, including heavy-duty mechanics. When measured in SI units, steel rules typically provide an accuracy of around 0.2 mm. This level of accuracy is sufficient for many applications where precise measurements are required, such as aligning components or checking tolerances in manufacturing and assembly processes.

The specification of 0.2 mm reflects the capability of a steel rule to provide consistent and reliable measurements within that margin of error. This makes it particularly useful for tasks that require a degree of precision, as it allows technicians to achieve accurate results in their work without the need for more complex measuring devices in scenarios where simplicity and speed are essential.