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Non-automatic weighing instruments (NAWI) directive



Non-automatic weighing instruments (NAWI) Directive (2014/31/EU)


This Directive shall apply to all non-automatic weighing instruments.

For the purposes of this Directive, the following categories of use of non-automatic weighing instruments shall be distinguished:

  • Determination of mass for commercial transactions;
  • Determination of mass for the calculation of a toll, tariff, tax, bonus, penalty, remuneration, indemnity or similar type of payment;
  • Determination of mass for the application of laws or regulations or for an expert opinion given in court proceedings;
  • Determination of mass in the practice of medicine for weighing patients for the purposes of monitoring, diagnosis and medical treatment;
  • Determination of mass for making up medicines on prescription in a pharmacy and determination of mass in analyses carried out in medical and pharmaceutical laboratories;
  • Determination of price on the basis of mass for the purposes of direct sales to the public and the making-up of prepackages;
  • All applications other than those listed in points (a) to (f).


For the purposes of this Directive, the following definitions shall apply:

  • ‘Weighing instrument’ means a measuring instrument serving to determine the mass of a body by using the action of gravity on that body. A weighing instrument may also serve to determine other mass-related magnitudes, quantities, parameters or characteristics;
  • ‘Non-automatic weighing instrument’ or ‘instrument’ means a weighing instrument requiring the intervention of an operator during weighing;


Directive 2014/31/EU of the European Parliament and of the Council on the harmonisation of the laws of the Member States relating to the making available on the market of Non-Automatic Weighting Instruments came into force from 20/April 2016 ad replaces Directive 2009/23/EC.

This Directive implements the text of EU Decision No 768/2008/EC and makes reference to Regulation (EC) No 765/2008 on accreditation and market surveillance.

The Directive has been implemented in the UK as Statutory Instrument 2016 No, 1152 – Weights & Measure, The Non-Automatic Weighing Instrument Regulation 2016

All instruments placed on the market after 20 April 2016 have to comply with the requirements in the Directive & Regulations listed above.

  Harmonised standards

EN 45501:2015 Metrological aspects of non-automatic weighing instruments
EN 45501:2015
Metrological aspects of non-automatic weighing instruments


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