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Norway covers an area of 386,958 sq km and has a population of 5.3 million.

Organisational Structure and Background

The Norwegian Metrology Service is a central government institution under the Ministry of Trade, Industry and Fisheries. The Norwegian Metrology Service was established in 1875 and is responsible for the Norwegian metrology infrastructure and for ensuring its national and international acceptance. 

The Norwegian Metrology Service have the following departments 

  • Surveillance department
  • The National Standards Laboratory
  • Development and regulations
  • Administration department. 


Norwegian Accreditation (NA) has since 2004 been a separate independent service under the same ministry. 

The National Standards Laboratory maintains the national measurements standards and is responsible for the dissemination of traceable measurements to authorities and industry. The National Standards Laboratory operates as the only Notified Body for measuring instruments in Norway. In addition, the department offers these services:

  • Calibrations up against national standards
  • Consultancy in metrology
  • Courses and seminars
  • Research and development projects


Surveillance department is responsible for all legal metrology activities including the inspection/verification of measuring instruments in use for trade. The development and regulations department is responsible for the development of regulations, of which some has to be decided by the ministry. For legal metrology purpose the country are divided into 5 verification districts, with a local office in each district

A law on measurements from January 2008, have basically focus on the measurements, not only on the measuring instruments. The law states that the need for regulations shall be based on socio-economic analyzes combined with risk assessment. The Norwegian Metrology Service are responsible for the analyses and for the following proposals for regulations. 

The law gives The Norwegian Metrology Service authorization to “design” inspection and verification activity that in the most cost effective way contribute to the purpose of the law of reliable measurements.

Equipment Subject to Regulation

  • Simple length measures in trade use
  • Non-liquid volume measures (volume of packages for transport controls)
  • Liquid volume measures
  • Dipsticks
  • Liquid volume metering instruments
  • Petroleum
  • Liquefied petroleum gas
  • Bulk milk
  • Lubricating oil
  • Heating oil
  • Non-automatic weighing instruments
  • Self-indicating
  • Non self-indicating
  • Automatic weighing instruments
  • Discontinuous totalizing
  • Continuous totalizing (belt weighs)
  • Gravimetric filling
  • Rail weighbridges
  • Weigh/price labeller and weigh labeller
  • Catch weighs
  • Road traffic instruments
  • Dynamic axle weighing instruments
  • Non-automatic weigh bridges


Inspection and Verification

The purpose of legal metrology is to give confidence that measurement results are sufficiently accurate. 

This confidence is secured by

  • regulations specifying accuracy of the instruments and measurement results 
  • type approval or other means of conformity assessment performed by a notified body 
  • initial verification of instruments and re-verification after repair has been done 

Inspections are carried out periodically, after a risk assessment or by sampling. Inspections most often includes testing of measurement accuracy.  

Examples of periodically inspections are given in the table. Year to year priorities in the inspection activity may cause the actual period to be longer in some cases.

At present, there is a requirement from the ministry that all activities on legal metrology by The Norwegian Metrology Service shall be covered by fees from the users.


Where an instrument by inspection is found not to fulfil the requirements, different courses of action are possible:

  • If the error is not too serious (does not exceed MPE x 3), the instrument has to be repaired within a proper time limit. 
  • If the error is serious, the instrument is sealed to prevent use and it has to be repaired within a certain time limit. Economic sanctions may be applied 


Directive 90/384/EEC (NAWI)

The Directive is implemented as regulation no 1735, 2007.12.21.

Gravity zones have been identified ranging from g = 9.818 m/s2 for Kristiansand to g = 9.826 for Tromsø. Class I and II instruments being required to be verified on the site of use.

Existing national class requirements relate to:

Precious stones, making up Medicines in pharmacies Class II
Trade purposes of general type Class III
Less valuable materials Class IV


Directive 2004/22/EC (MID)

Different regulation, all under the same law, implements the directive in Norway. The regulations make it mandatory to fulfil the requirements of MID for the following areas:

  • Water meters 
  • Heat meters
  • Electricity meters* 
  • Measuring systems for liquids other than water* 
  • Automatic weighing instruments* 
  • Material Measures (except capacity serving measures)* 
  • Dimensional measuring instruments (except area measuring instruments)* 
  • Exhaust gas analyzers* 
  • Taximeters* 

 (* also regulated under use) 

Special requirements for use of specific accuracy classes for different applications do exist.

Notified Bodies

The National Standards Laboratory department is a Notified Body (no 0431) under NAWI and most of the instruments/modules under MID. There is no other Notified Body on these directives in Norway.

Contact information


Visiting addressMail address
Fetveien 99
N-2007 Kjeller
Postboks 170
2027 Kjeller

+ 47 64 84 84 84 


Updated August 2015