The National Metrology Institute of South Africa (NMISA) Gas Flow Laboratory providestraceability to the South African Industry for gas flow measurements. A new primarystandard for gas flow calibrations was purchased and commissioned. With three flow cells,a flow range of 0.5 mL/min to 50 000 mL/min is covered. The main features of this standardare accuracy, speed and convenience. This paper describes the activities of the NMISA GasFlow Laboratory – a discussion of the primary standard, the validation thereof,calibration methods for client instrumentation, analysis of measurement results and thecalculation of measurement uncertainties.