MSL is the New Zealand home for the international system of units, the 'SI'.
The basic structure of SI was developed over a period of about 170 years (1791 to 1960). Since 1960 technological advances have made it possible to address various weaknesses in SI, such as the dependence on an artefact to define the kilogram. In May 2019 four of these units: the Kilogram, the Ampere, the Kelvin and the Mole are planned to be redefined in terms of fixed fundamental constants. For more information about the units, the redefinition and how it may effect you, click read more below or contact us.