21 April 2023

Prestation d’étalonnage

Since 1994, CT2M has been accredited by COFRAC* for mass calibration (scope of accreditation no. 2-1292 available on the website www.cofrac.fr).

High-performance calibration resources

The different areas of the laboratory:

Weight calibration laboratory (1 mg - 5 kg)

MassExpanded uncertainty (k=2)MassExpanded uncertainty (k=2)
1 mg, 2 mg et 5mg2,0 µg10 g20 µg
10 mg2,6 µg20 g26 µg
20 mg3,3 µg50 g33 µg
50 mg4,0 µg100 g53 µg
100 mg5,0 µg200 g0,10 mg
200 mg6,6 µg500 g0.26 mg
500 mg8,0 µg1 kg0,50 mg
1 g10 µg2 kg3,3 mg
2 g13 µg5 kg8,3 mg
5 g16 µg

Weight calibration laboratory (10 kg - 1t)

MassExpanded uncertainty (k=2)
10 kg16 mg
20 kg30 mg
50 kg200 mg
60 kg200 mg
100 kg1,6 g
200 kg3,3 g
500 kg8,3 g
1000 kg15 g

Weight calibration laboratory (2t - 5t)

MassExpanded uncertainty (k=2)
2000 kg33 g
5000 kg80 g

Weights ≥ 1 t: our specificity and expertise

The CT2M has calibration facilities for calibrating masses of up to 5 tonnes. This type of calibration requires special equipment and know-how:

  • appropriate handling equipment (overhead travelling crane)
  • custom-built comparators (our comparator has a resolution of 10 g, enabling calibration of masses of 2 and 5 tonnes)
  • high quality standards

Calibration and verification

Calibration onlyCalibration + verification
Supply of a calibration certificate stating :Supply of a calibration certificate and a verification certificate
the 'true' value of your mass (called the conventional mass)
the associated calibration uncertainty
The declaration of conformity can be based on regulatory texts (OIML R111  or circular masses) OR on your own MTE (Maximum Tolerated Errors).
This service is suitable if you use your mass based on its "true" value (e.g. 50.0023 g).This service is suitable if you use your weight at its nominal value (e.g. 50 g).


OIML R111 defines classes of weights used in legal metrology. For example, for standards used to calibrate supermarket scales. This classification is also commonly adopted by laboratories not subject to legal metrology, although it is not compulsory for them.

Specific MTE (Maximum Tolerated Errors)

Outside legal metrology, you have the possibility to define your own MPMEs and calibration uncertainties according to your needs.

Adjusting and maintaining traceability

If your standards do not conform (too heavy or too light), we can adjust them to make them conform to the defined EMT. Adjustment involves adding or removing material by abrasion, sanding or using the adjustment cavity.

Before any work is carried out on your weights (adjustment or recalibration), we carry out an initial calibration to guarantee the traceability of your standard since the last calibration. Note that this prior calibration is mandatory in legal metrology.

At your service

Contact us / Request a quote

*French Accreditation Committee (COFRAC

A national body that assesses the competence and impartiality of laboratories to give you confidence in their services.