The Weights and Measures (Packaged Goods) Regulations 2006

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1.  REQUIREMENTS FOR MEASURING THE ACTUAL CONTENTS OF PACKAGES

1.1 The actual contents of packages may be measured directly by means of weighing instruments or volumetric instruments or, in the case of liquids, indirectly, by weighing the packed product and measuring its density.

1.2 In all operations for checking quantities of products expressed in units of volume, the value employed for the actual contents shall be measured at or corrected to a temperature of 20°C, whatever the temperature at which packaging or checking is carried out. However this rule shall not apply to deep frozen or frozen products the quantity of which is expressed in units of volume.

1.3 Irrespective of the method used, the error made in measuring the actual contents of a package shall not exceed one-fifth of the tolerable negative error for the nominal quantity in the package.