What is the reference method?

The method strictly defines the requirements for the method of carrying out measurements of a batch of goods and their results. It determines the number of samples of goods taken from the batch, the formulas for calculating the average value and the permissible error of the net mass (T1) and the qualifying values ​​for the measurement results.

Two types of control are described:

- destructive control - measurement of the net weight of a sample consisting of 20 pieces (packages are destroyed when opened),

- non-destructive inspection - two-stage inspection, two samples are taken from a batch of goods, the amount taken for samples depends on the number of batches of goods, if the results of the first sample are unambiguous, the second sample is not needed.

The permissible number of defective items depends on the size of the batch and is given in the tables. The average value must correspond to the nominal value, taking into account a slight deviation resulting from the statistical method of calculating the average.

A detailed description of the reference method is contained in Annex 2 to the Act on Packaged Goods.