| 2 | PV Metrology a division of Premier Valve (Pty) Ltd | Alrode | Gauteng | Dimensional Metrology |
| 4 | South African Airways (SAA) Technical SOC Ltd | Johannesburg | Gauteng | Dimensional Metrology |
| 5 | Rheinmetall Denel Munition (Pty) Ltd | Potchefstroom | North West | Dimensional Metrology |
| 10 | METGAUGE | Johannesburg | Gauteng | |
| 11 | Volkswagen of SA (Pty) Ltd | Uitenhage | Eastern Cape | Dimensional Metrology |
| 17 | Linberts Calibration Services - Alstom Electrical Machines (Factory) | Benoni | Gauteng | Dimensional Metrology |
| 22 | HJR Microptic cc | Pretoria | Gauteng | Dimensional Metrology |
| 23 | Eskom Rotek Industries SOC Ltd | Johannesburg | Gauteng | Dimensional Metrology |
| 28 | Westrand Metrology Services cc | Krugersdorp | Gauteng | Dimensional Metrology |
| 33 | Protsurv Geo Centre (Pty) Ltd | Kempton Park | Gauteng | Dimensional Metrology |
| 34 | RGC Engineering (Pty) Ltd | Johannesburg | Gauteng | Dimensional Metrology |
| 35 | Ross Calibration Services | Durban | KwaZulu-Natal | Dimensional Metrology |
| 36 | Midlands Metrology (Pty) Ltd | Boksburg | Gauteng | Dimensional Metrology |
| 37 | Dimensional and Torque Tool Calibration (Pty) Ltd | Amanzimtoti | KwaZulu-Natal | Dimensional Metrology |
| 42 | Cape Metrology Field Service CC | Blackheath | Western Cape | Dimensional Metrology |
| 49 | Truvelo Manufacturers (Pty) Ltd | Midrand | Gauteng | |
| 52 | Intercalibration (Natal) Pty Ltd | Durban North | KwaZulu-Natal | Dimensional Metrology |
| 74 | Wisio CC | East London | Eastern Cape | Dimensional Metrology |
| 101 | TRAC Laboratories cc | Alberton | Gauteng | DCLF Metrology |
| 105 | Eskom Cape Town SOC Ltd | Brackenfell | Western Cape | DCLF Metrology |
| 106 | Concilium Technologies (Pty) Ltd | Highveld Technopark, Centurion | Gauteng | DCLF Metrology |
| 108 | South African Airways (SAA) Technical SOC Ltd | Johannesburg | Gauteng | |
| 1101 | Telkom SA SOC Ltd | Pretoria | Gauteng | |
| 1101/S1 | Telkom SA SOC Ltd | Cape Town | Western Cape | |
| 1105 | Technology Solutions | Irene, Pretoria | Gauteng | Photometry Metrology |
| 1139 | Intercal (Pty) Ltd | Midrand | Gauteng | Photometry Metrology |
| 118 | PJB Contracting cc T/A Calibrate @ PJB | Kempton Park | Gauteng | DCLF Metrology |
| 1201 | SABS Commercial SOC Ltd | Pretoria | Gauteng | Radiation Dosimetry Metrology |
| 1203 | The South African Nuclear Energy Corporation Ltd (NECSA) | Pretoria | Gauteng | Radiation Dosimetry Metrology |
| 122 | Telkom SA SOC Ltd | Pretoria | Gauteng | |
| 122/S1 | Telkom SA SOC Ltd | Cape Town | Western Cape | |
| 129 | Repair And Metrology Services (Pty) Ltd | Sandton | Gauteng | DCLF Metrology |
| 1302 | M and N Acoustic Services cc | Pierre van Ryneveld | Gauteng | Acoustics & Vibration Metrology |
| 139 | Intercal (Pty) Ltd | Midrand | Gauteng | DCLF Metrology |
| 1403 | Sasco Metrology Service (Pty) Ltd | Benoni | Gauteng | Mass Metrology |
| 1405 | National Regulator for Compulsory Specifications -NRCS | Pretoria | Gauteng | Mass and Volume Metrology |
| 1406 | Unique Metrology (Pty) Ltd | Johannesburg | Gauteng | Mass Metrology |
| 1407 | Weighing Instrument Services (Pty) Ltd | Johannesburg | Gauteng | Mass Metrology |
| 1409 | Micron Laboratory Services (Pty) Ltd | Witbank | Mpumalanga | Mass Metrology |
| 1410 | National Regulator for Compulsory Specifications - NRCS | Cape Town | Western Cape | Mass Metrology |
| 1411 | National Regulator for Compulsory Specifications- NRCS | Durban | KwaZulu-Natal | Mass Metrology |
| 1412 | National Regulator for Compulsory Specifications - NRCS | Port Elizabeth | Eastern Cape | |
| 1415 | Sarto Mass Services cc | Randburg | Gauteng | Mass Metrology |
| 1417 | PC Lab Services cc | Benoni | Gauteng | Mass Metrology |
| 1422 | Route Calibration Services | Pretoria | Gauteng | Mass Metrology |
| 1424 | Labtronic | Port Elizabeth | Eastern Cape | Mass & Volume Metrology |
| 1425 | Gauteng Metrology Services cc | Anderbolt | Gauteng | Mass Metrology |
| 1426 | Somandla Calibration Solutions | Kempton Park, Rhodesfield | Gauteng | Mass Metrology |
| 143 | Power Meter Technics (Pty) Ltd | Midrand | Gauteng | DCLF Metrology |
| 1434 | Weighing & Control Equipment cc | Port Elizabeth | Eastern Cape | Mass Metrology |
| 1436 | LABFIX | Durban | KwaZulu-Natal | Mass Metrology |
| 1437 | R A M Instrumed Services | Bloemfontein | Free State | Mass Metrology |
| 1439 | Intercal (Pty) Ltd | Midrand | Gauteng | Mass and Volume Metrology |
| 1441 | Welfield Metrology (Pty) Ltd | Pretoria | Gauteng | Mass and Volume Metrology |
| 1446 | Repcal Services cc | Midrand | Gauteng | Mass and Volume Metrology |
| 1447 | HJR Microptic | Pretoria | Gauteng | Mass Metrology |
| 1455 | Trilab Support cc | Pinetown | KwaZulu-Natal | Mass and Volume Metrology |
| 1457 | Clover Scales (Pty) Ltd | Randburg | Gauteng | Mass Metrology |
| 1458 | CM Lab (Pty) Ltd | Port Elizabeth | Eastern Cape | Mass and Volume Metrology |
| 1459 | Denel Aeronautics | Bonaero Park | Gauteng | Mass Metrology |
| 146 | Repcal Services CC | Midrand | Gauteng | DC Low Frequency Metrology |
| 1460 | Lasec SA (Pty) Ltd | Ndabeni | Western Cape | Mass and Volume Metrology |
| 1466 | Rapid Instrumentation cc | Bellville, Cape Town | Western Cape | Mass Metrology |
| 1468 | Elcondor Trading - Trading as UWE Scales | Cape Town | Western Cape | Mass Metrology |
| 1469 | Mass Measuring Systems Trading as Masscal (Pty) Ltd | Gauteng | Gauteng | Mass Metrology |
| 147 | HJR Microptic cc | Pretoria | Gauteng | DCLF Metrology |
| 1472 | Scale Tronics Services (Pty) Ltd | Steeldale | Gauteng | Mass Metrology |
| 1473 | East Rand Scales cc | Springs | Gauteng | Mass Metrology |
| 1475 | Associated Scale Corporation CC | Johannesburg | Gauteng | Mass Metrology |
| 1476 | Klerkscale Klerksdorp (Pty) Ltd, Mass Calibration Laboratory | Klerksdorp | North West | Mass Metrology |
| 1477 | Scales Incorporated | Brackenfell | Western Cape | Mass Metrology |
| 148 | M and N Acoustic Services cc | Pierre van Ryneveld | Gauteng | DCLF Metrology |
| 150 | Precision Measurements (Pty) Ltd | Pretoria | Gauteng | DCLF Metrology |
| 1503 | Eskom Research Testing and Development SOC Ltd | Johannesburg | Gauteng | Gas Metrology |
| 1505 | Air Liquide (Pty) Ltd | Alrode | Gauteng | Gas Metrology |
| 1508 | C & M Consulting Engineers cc | Silverton | Gauteng | Gas Metrology |
| 1516 | LABFIX | Durban | KwaZulu-Natal | Fluid Dynamics Metrology |
| 1518 | PJB Contracting cc T/A Calibrate @ PJB | Kemptont Park | Gauteng | Humidity Metrology |
| 152 | Intercalibration (Natal) Pty Ltd | Durban North | KwaZulu-Natal | DCLF Metrology |
| 1522 | Telkom SA SOC Ltd | Pretoria | Gauteng | Gas Metrology |
| 1524 | Labtronic | Port Elizabeth | Eastern Cape | Fluid Dynamics Metrology |
| 1539 | Intercal (Pty) Ltd | Midrand | Gauteng | Humidity Metrology |
| 1546 | Repcal Services cc | Midrand | Gauteng | Humidity Metrology |
| 1549 | Inteltronics Instrumentation | Western Cape | Western Cape | Meteorological Instrument Calibration |
| 1555 | Trilab Support CC | Pinetown | KwaZulu-Natal | Humidity Metrology |
| 1556 | Monitoring & Control Laboratories (Pty) Ltd | Linbro | Gauteng | Fluid Dynamics Metrology |
| 1565 | Archimedes Laboratory Solutions cc | Benoni | Gauteng | Humidity Metrology |
| 1571 | Montech Calibration Services (Pty) Ltd | Randburg | Gauteng | Humidity Metrology |
| 1575 | LMC Solutions (Pty) Ltd | Pretoria | Gauteng | Humidity Metrology |
| 1576 | TESTO SOUTH AFRICA (PTY) LTD | Kempton Park | Gauteng | Gas Metrology |
| 1577 | Testo South Africa (Pty) Ltd | Cape Town | Western Cape | Humidity Metrology |
| 1578 | Fairbridge Technologies (Pty) Ltd | Johannesburg | Gauteng | Humidity Metrology |
| 1579 | Science and Measurements Services (Pty) Ltd | Pretoria | Gauteng | Humidity Metrology |
| 159 | Denel Aeronautics | Bonaero Park | Gauteng | DCLF Metrology |
| 1600 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Acoustics & Vibration Metrology |
| 1601 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Gas Metrology |
| 1602 | National Metrology Institute of South Africa | Pretoria | Gauteng | Force Metrology |
| 1603 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Temperature Metrology |
| 1604 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Time & Frequency Metrology |
| 1605 | National Metrology Institute of South Africa | Pretoria | Gauteng | Mass Metrology |
| 1606 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Dimensional Metrology |
| 1607 | National Metrology Institute of South Africa | Pretoria | Gauteng | Radiation Dosimetry Metrology |
| 1608 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Radio Frequency Metrology |
| 1610 | National Metrology Institute of South Africa | Rosebank, Cape Town | Western Cape | Radioactivity Metrology |
| 1611 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Photometry and Radiometry Metrology |
| 1612 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | DCLF Metrology |
| 1613 | National Metrology Institute of South Africa | Pretoria | Gauteng | Humidity Metrology |
| 1614 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Pressure Metrology |
| 1615 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Inorganic Plasma Spectrometry Metrology |
| 1616 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Organic Chemistry Metrology |
| 1618 | National Metrology Institute of South Africa | Pretoria | Gauteng | Fibre Optics Metrology |
| 1620 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Flow Metrology |
| 1621 | National Metrology Institute of South Africa | Brummeria, Pretoria | Gauteng | Torque Metrology |
| 172 | Elster Kent Metering (Pty) Ltd | Johannesburg | Gauteng | DCLF Metrology |
| 173 | City of Cape Town | Cape Town | Western Cape | DCLF Metrology |
| 174 | Landis and Gyr (Pty) Ltd | Pretoria | Gauteng | DCLF Metrology |
| 175 | Isocal Laboratories CC | Randburg | Gauteng | DCLF Metrology |
| 176 | Mecalc (Pty) Ltd | Centurion | Gauteng | DCLF Metrology |
| 205 | Unique Metrology (Pty) Ltd | Johannesburg | Gauteng | Pressure Metrology |
| 208 | Repcal Services cc | Midrand | Gauteng | Pressure Metrology |
| 210 | Denel Aeronautics | Bonaero Park | Gauteng | Pressure Metrology |
| 211 | South African Airways (SAA) Technical SOC Ltd | Johannesburg | Gauteng | |
| 212 | HJR Microptic cc | Pretoria | Gauteng | Pressure Metrology |
| 216 | LABFIX | Durban | KwaZulu-Natal | Pressure Metrology |
| 218 | PJB Contracting cc T/A Calibrate @ PJB | Kempton Park | Gauteng | Pressure Metrology |
| 239 | Intercal (Pty) Ltd | Midrand | Gauteng | Pressure Metrology |
| 245 | SA Gauge (Pty) Ltd | Durban | KwaZulu-Natal | Pressure Metrology |
| 246 | WIKA Instruments (Pty) Ltd | Johannesburg | Gauteng | Pressure Metrology |
| 246/S1 | WIKA Instruments (Pty) Ltd | Cape town | Western Cape | Pressure Metrology |
| 246/S3 | WIKA Instruments (Pty) Ltd | Durban | KwaZulu-Natal | Pressure Metrology |
| 271 | Rhomberg Instruments (Pty) Ltd | Kuilsrivier , Cape Town | Western Cape | Pressure Metrology |
| 275 | Isocal Laboratories CC | Randburg | Gauteng | Pressure Metrology |
| 280 | Algoa Controls CC | Port Elizabeth | Eastern Cape | Pressure Metrology |
| 282 | SAF LAB (Pty) Ltd | Durban | KwaZulu-Natal | Pressure Metrology |
| 305 | Technology Solutions | Irene, Pretoria | Gauteng | Temperature Metrology |
| 306 | Unique Metrology (Pty) Ltd | Johannesburg | Gauteng | Temperature Metrology |
| 308 | Repcal Services CC | Midrand | Gauteng | Temperature Metrology |
| 313 | Micron Laboratory Services (Pty) Ltd | Witbank | Mpumalanga | Temperature Metrology |
| 316 | LABFIX | Durban | KwaZulu-Natal | Temperature Metrology |
| 317 | Airsep SA cc | Bedfordview | Gauteng | Temperature Metrology |
| 318 | PJB Contracting cc T/A Calibrate @ PJB | Kempton Park | Gauteng | Temperature Metrology |
| 324 | Labtronic | Port Elizabeth | Eastern Cape | Temperature Metrology |
| 329 | Repair And Metrology Services (Pty) Ltd | Sandton | Gauteng | Temperature Metrology |
| 339 | Intercal (Pty) Ltd | Midrand | Gauteng | Temperature Metrology |
| 345 | SA Gauge (Pty) Ltd | Durban | KwaZulu-Natal | Temperature Metrology |
| 346 | WIKA Instruments (Pty)Ltd | Johannesburg | Gauteng | Temperature Metrology |
| 346/S1 | WIKA Instruments (Pty) Ltd | Cape Town | Western Cape | Temperature Metrology |
| 346/S3 | WIKA Instruments (Pty) Ltd | Durban | KwaZulu-Natal | Temerature Metrology |
| 352 | Intercalibration (Natal) Pty Ltd | Durban North | KwaZulu-Natal | Temperature Metrology |
| 356 | Monitoring & Control Laboratories (Pty) Ltd | Linbro | Gauteng | Temperature Metrology |
| 357 | Trilab Support CC | Pinetown | KwaZulu-Natal | Temperature Metrology |
| 359 | Denel Aeronautics | Bonaero Park | Gauteng | Temperature Metrology |
| 360 | Lasec SA (Pty) Ltd | Ndabeni | Western Cape | Temperature Metrology |
| 365 | Archimedes Laboratory Solutions cc | Benoni | Gauteng | Temperature Metrology |
| 366 | Rapid Instrumentation cc | Bellville, Cape Town | Western Cape | Temperature Metrology |
| 371 | Montech Calibration Services (Pty) Ltd | Randburg | Gauteng | Temperature Metrology |
| 375 | LMC Solutions (Pty) Ltd | Pretoria | Gauteng | Temperature Metrology |
| 376 | Testo South Africa (Pty) Ltd | Kempton Park | Gauteng | Temperature Metrology |
| 377 | Testo South Africa (Pty) Ltd | Cape Town | Western Cape | Temperature Metrology |
| 378 | Fairbridge Technologies (Pty) Ltd | Johannesburg | Gauteng | Temperature Metrology |
| 379 | Science and Measurements Services (Pty) Ltd | Pretoria | Gauteng | Temperature Metrology |
| 380 | Algoa Controls CC | Port Elizabeth | Eastern Cape | Temperature Metrology |
| 381 | SI Calibration (Pty) Ltd | Boksburg | Gauteng | Temperature Metrology |
| 501 | TRAC Laboratories cc | Alberton | Gauteng | Time & Frequency Metrology |
| 506 | Concilium Technologies (Pty) Ltd | Highveld Technopark, Centurion | Gauteng | Time & Frequency Metrology |
| 522 | Telkom SA SOC Ltd | Pretoria | Gauteng | |
| 522/S1 | Telkom SA SOC Ltd | Cape Town | Western Cape | |
| 524 | Labtronic | Port Elizabeth | Eastern Cape | Time & Frequency Metrology |
| 529 | Repair And Metrology Services (Pty) Ltd | Sandton | Gauteng | Time & Frequency Metrology |
| 539 | Intercal (Pty) Ltd | Midrand | Gauteng | Time & Frequency Metrology |
| 549 | Truvelo Manufacturers (Pty) Ltd | Midrand | Gauteng | |
| 550 | Precision Measurements (Pty) Ltd | Pretoria | Gauteng | Time & Frequency Metrology |
| 552 | Intercalibration (Natal) Pty Ltd | Durban North | KwaZulu-Natal | Time & Frequency Metrology |
| 579 | Science and Measurements Services (Pty) Ltd | Pretoria | Gauteng | Time and Frequency Metrology |
| 706 | Concilium Technologies (Pty) Ltd | Highveld Technopark, Centurion | Gauteng | Radio Frequency Metrology |
| 739 | Intercal (Pty) Ltd | Midrand | Gauteng | Radio Frequency Metrology |
| 745 | Business Enterprise at University of Pretoria (Pty) Ltd | Pretoria | Gauteng | |
| 750 | Precision Measurements (Pty) Ltd | Pretoria | Gauteng | Radio Frequency |
| 804 | South African Airways (SAA) Technical SOC Ltd | Johannesburg | Gauteng | Force Metrology |
| 816 | SPS Calibration Services (Pty) Ltd | Boksburg East | Gauteng | Force Metrology |
| 817 | Torque Tool (Pty) Ltd | Johannesburg | Gauteng | Torque Metrology |
| 818 | PJB Contracting cc T/A Calibrate @ PJB | Kempton Park | Gauteng | Force Metrology |
| 822 | HJR Microptic cc | Pretoria | Gauteng | Force Metrology |
| 823 | Eskom Rotek Industries SOC Ltd | Johannesburg | Gauteng | Force Metrology |
| 825 | Gauteng Metrology Services cc | Benoni | Gauteng | Force Metrology |
| 827 | Advanced Laboratory Solutions (Pty) Ltd | Johannesburg | Gauteng | Force Metrology |
| 829 | Moisson Instrumentation (Pty) Ltd | Johannesburg | Gauteng | Force Metrology |
| 830 | Hyper Pneumatics Eastern Cape cc | Port Elizabeth | Eastern Cape | Torque Metrology |
| 833 | Protsurv Geo Centre (Pty) Ltd | Kempton Park | Gauteng | Force Metrology |
| 837 | Dimensional and Torque Tool Calibration (Pty) Ltd | Amanzimtoti | KwaZulu-Natal | Force/Torque Metrology |
| 838 | Gedore Tools SA (Pty) Ltd | Pinetown | KwaZulu-Natal | Torque Metrology |
| 840 | PG Test Services cc | Killarney Gardens | Western Cape | Force Metrology |
| 842 | Cape Metrology Field Service cc | Blackheath | Western Cape | Force Metrology |
| 846 | Repcal Services cc | Midrand | Gauteng | |
| 865 | Archimedes Laboratory Solutions cc | Benoni | Gauteng | Force Metrology |
| 866 | Rapid Instrumentation CC | Cape Town | Western Cape | Force Metrology |
| 870 | Atlas Copco Industrial Technique (Pty) Ltd | Boksburg | Gauteng | Torque Metrology |
| 875 | Isocal Laboratories CC | Randburg | Gauteng | Torque Metrology |
| 892 | AFS Calibration Logistics (Pty) Ltd | Pretoria | Gauteng | Torque Metrology |
| 901 | Eskom Enterprises - Research Test and Development SOC Ltd | Cleveland | Gauteng | Flow Metrology |
| 905 | Technology Solutions | Pretoria | Gauteng | Fluid Flow Metrology |
| 906 | CSIR DSC - ASIA | Pretoria | Gauteng | Flow Metrology - Air Speed Metrology |
| 967 | Endress and Hauser (Pty) Ltd | Johannesburg | Gauteng | |