Plus Tolerance in Calibration Weights

Weights are calibrated according to OIML maximum permissible errors (+/- in mg). If the result of the calibration is in the plus range, it means that the weight is heavier than the specified nominal value, but still within the tolerance.

Since most weights lose weight over time due to wear, it is more likely that this weight will take longer to fall out of tolerance (maximum permissible error). Through our production processes, most of our weights are calibrated in the plus range.

This approach to calibration helps extend the useful life of weights by accounting for the natural wear that occurs during normal use. Weights calibrated in the plus range provide a safety margin that helps maintain accuracy over time.

The plus tolerance strategy is a practical approach that balances the need for accuracy with the reality of weight wear, helping users get maximum value from their calibration weights while maintaining measurement reliability.