What is the difference between class F1 and M2 calibration weights?

Class F1 and M2 calibration weights differ in accuracy, tolerance, and application.

F1 weights are high-precision weights used for calibrating sensitive laboratory balances, precision industrial scales, and analytical instruments.

M2 weights, on the other hand, have a higher permissible tolerance and are commonly used for verifying general-purpose weighing devices in industrial, commercial, and retail environments.

A key difference between these classes is their tolerance levels. For example, a 1kg F1 weight has a tolerance of ±5 mg, while a 1kg M2 weight has a tolerance of ±500 mg. This means F1 weights must be within a much narrower range of their nominal value, ensuring superior accuracy.

F1 weights are manufactured with strict adherence to OIML (International Organization of Legal Metrology) standards and are typically used in laboratories, pharmaceutical industries, and research facilities where precision is critical. They are often made of polished stainless steel to prevent contamination and corrosion. M2 weights, while still reliable, are used in applications where absolute precision is less important, such as catering, market scales, warehouse weighing systems, and industrial environments.

In summary, F1 weights are designed for high-accuracy needs, whereas M2 weights are suitable for general industrial and commercial weighing tasks.