Rwanda Standards Board


Metrology is the science of measurement and it includes all theoretical and practical aspects of measurement.

The National Metrology Division (NMD) is one of the five divisions that constitute Rwanda Standards Board (RSB).  Through Mechanical and Electrical laboratories, Chemical Metrology and Legal Metrology units offer industrial metrology and legal metrology services.

1. Industrial Metrology

Industrial metrology helps to:

  • Establish and maintain national measurement standards demonstrably traceable to international metrology standards for the relevant metrology quantities.
  • Ensure that a national calibration system is established and maintained to disseminate metrology standards to industry, authorities and the society.
  • Represent the country at the regional and international Metrology Associations. 
  • Under the three areas of Industrial metrology, i.e: Mechanical metrology, Electrical metrology and Chemical metrology, the following laboratories have been established;

A. Mechanical Metrology

Mechanical metrology helps to realize, maintain and disseminate the national measurement standards for following areas: Mass, Volume, Pressure, temperature and Dimensions. Laboratories established in this regard include:

  • Mass laboratory:  The Mass laboratory offers services of calibration of standards masses and masses from industries.
  • Volume laboratory: The Volume laboratory conducts calibration of laboratory glassware (Pipettes, Graduated cylinders, Burettes, Density bottles, volumetric flasks,…), Piston-operated volumetric apparatus (Micropipettes, dispensers, piston burettes,…) and tanks as part of Legal metrology activities.
  • Pressure laboratory: The Pressure laboratory conducts calibration of different types of industrial pressure gauges and blood pressure gauges.
  • Temperature laboratory:  The Temperature laboratory conducts calibration of thermometers, laboratory ovens, incubators, cold rooms, Autoclaves, fridges and freezers, coolers, furnaces and truck refrigerators.
  • Dimensions laboratory: The Dimension laboratory undertakes the following calibrations: Vernier Calipers, micrometer screw gauges, block gauges, tapes, meters, rulers, dipsticks and centrifuges.
  • Flow laboratory: The Flow laboratory offers service of calibration of flow meters and water meters.
  • Balance laboratory: The Balance laboratory conducts calibration of all types of balances and weighbridges.
  • Force laboratory:  The Force laboratory conducts calibration of compression Machines : 1kN – 3,000kN, CBR testing Machines (rings) 1 – 100kN,Marshall testing machine (rings) 1 – 100kN and tensile testing machines 1 – 100kN.

B. Electrical Metrology

Electrical metrology helps to realize, maintain and disseminate the national measurement standards for the following areas: AC/DC, low frequency, time & frequency and electrical energy.

Laboratories that were established include:

  • AC/DC Laboratory:  Conducts calibration of Ammeters, Voltmeters, Multi-meters, Ohmmeters, Inductance meters ,Capacitance meters, Voltage Sources and pH meters.
  • Energy laboratory: Power and Energy Laboratory makes calibration of single phase mechanical and electronic  electricity meters, three phase mechanical and electronic electricity meters, and Polyphase electronic energy meters
  • Time and frequency laboratory conducts calibration of Measurement Amplifiers ,Timers/Stop watch, Signal Generators, Spectrum Analyzers, Communications monitors, Noise meters, Frequency meters ,Time meters, Oscilloscopes.

C. Chemical metrology;

Chemical metrology helps to realize, maintains and disseminates measurements standards in chemical measurements.

The Chemical metrology laboratory that will be established in the near future will offer service of calibration of the following equipments:

  • Ph meter
  • Alcohol meter
  • Density meter
  • Electrolytic conductivity meter
  • Viscosity meter

2. Legal Metrology

The purpose of Legal metrology is to:

  • Control  the usage of measuring equipment in trade, law enforcement, health services and environmental protection through type approval, initial and periodic verifications and inspections;
  • Control pre-packaging operations ;
  • Manage regional and international relationships in the area of legal metrology.

NMD offers the following Legal metrology services:

- Verification of trade masses  
- Verification of balances
- Verification of fuel dispensers
- Verification of bulk meters
- Verification of energy meters
- Verification of water meters
- Verification of medical equipment
- Pre-packed products control
- Licensing maintenance/repairs operators

The importance of Metrology-Why do we measure?

  1. Metrology is the science of measurement

  2. One can manufacture, only one can measure

Metrology facilitates fair trade through harmonized written standards, consistent measurement standards, and internationally accepted certificates.

Metrology drives innovation because it enables and drives industrial innovation in advanced production and instrumentation.

Metrology supports regulation by providing measurement references for policy advice, directives, conformity assessment, and verification.

When paying for a liter of gasoline, it is expected that one liter of gasoline has been delivered!

A measurement error of 1% in the amount of fuel consumed in a country in a year corresponds to an economic impact of loss of billions.

Metrology advances the protection of citizens
Results of blood tests should be independent of the laboratory performing the test

Incorrect doses can be dangerous. Under dosing may not adequately treat an illness. Overdosing, on the other hand, may cause illness or side effects that can be lethal.

The metrological infrastructure has to ensure that the instruments used in temperature, weights are issuing the right measurements through calibration and verification and traceable to international measurement standards

Metrology helps meet societal goals, such as increase energy efficiency and reduced consumption of resources.

Download the Scope of Calibration and Verification Services Offered by the National Metrology Division