Assured Confidence

Mass Calibration

Key Equipment List

  • State-of-the-art laboratories with environmental and vibration control.
  • Sets of reference mass standards - E0, E1, E2 and F1 classes
  • High accuracy computerised electronic mass comparators.


List of instruments calibrated by NML:

Mass standards & standard weights from 1mg up to 1000kg (metric and imperial) OIML Class E2, F1, F2, M1, M2 and M3

Masses cleaned and adjusted where necessary. Refurbishment service available for cast iron weights.
Measurement Range Best Measurement Uncertainty (sample)
OIML Class E2 1mg – 20kg 1/5th of OIML tolerance
OIML Class F1 & F2 1mg – 50kg 1/5th of OIML tolerance
OIML Class M1 1mg – 1000kg 1/5th of OIML tolerance
OIML Class M2 100mg – 1000kg 1/5th of OIML tolerance
OIML Class M3 1g – 1000kg 1/5th of OIML tolerance

Detailed Calibration Capabilities


Rory Hanrahan

NSAI National Metrology Laboratory,
Dublin 9, Ireland

T: +353 1 808 2611
F: +353 1 808 2603
News & Events

NSAI Celebrates 20 Years of Setting Standards in Ireland

The world may have changed substantially since 1997, but the role of NSAI in supporting businesses and protecting consumers has remained as important as ever. Read more...


Donegal Fish Processor Fined €45,000 for Tampering with Weighing Scales

This follows a joint investigation carried out by NSAI and the Sea Fisheries Protection Agency. Read more...

NSAI Tweets
NSAI Media Channel