| COOMET Program | COOMET P2/2023 | |
| COOMET PROGRAM OF COMPARISONS | ||
| Approved at the 34th COOMET Presidential Council meeting (14 March 2026) | as of 29.12.2025 | |
AUV - Acoustics, Ultrasound and Vibrations
5projects.
from 14.03.2023: 1 - proposed; 0 - agreed; 1 - completed; 0 - excluded;
| actualisation | project number | state | subject | type of comparison | x |
|---|---|---|---|---|---|
| 27.10.2025 | 895/TR/23 | Proposed | Supplementary comparison on calibration of microphones | Supplementary | |
| 13.12.2025 | 790/TR-a/19 | Agreed | Supplementary comparison on calibration of sound calibrators | supplementary COOMET.AUV.A-S4 |
|
| 02.07.2026 | 757/RU-a/18 | Agreed | Supplementary comparison of national standards of the sound pressure unit in air through determines the pressure sensitivity level of WS2 type working standard microphones in the low frequency range | supplementary COOMET.AUV.A-S3 |
|
| 05.04.2026 | 786/RU-a/19 | completed | Comparisons of the results of amplitude-phase calibrations of hydrophones in the frequency range from 10 kHz to 500 kHz | pilot | |
| 07.06.2026 | 846/RU/21 | Excluded | Regional key comparisons in the field of ultrasound power measurement in water | key |
EM - Electricity And Magnetism
12projects.
from 14.03.2023: 1 - proposed; 2 - agreed; 3 - completed; 0 - excluded;
| actualisation | project number | state | subject | type of comparison | x |
|---|---|---|---|---|---|
| 16.03.2026 | 874/RU/23 | Proposed | Supplementary comparisons of standards of electrostatic field strength unit | Supplementary | |
| 25.10.2025 | 862/RU/22 | Proposed | Pilot comparisons of reference instruments measuring AC high voltage of power frequency | Pilot | |
| 21.04.2026 | 859/TR/22 | Proposed | Supplementary comparison of high current transformer measuring systems | supplementary | |
| 13.01.2026 | 799/UA/20 | Proposed | Supplementary comparisons of electric field strength measurements | supplementary | |
| 07.11.2025 | 855/RU-a/22 | Agreed | Pilot comparisons in the field of high DC current measurements | pilot | |
| 21.05.2026 | 821/RU-a/20 | Agreed | Pilot comparisons of DC high voltage reference measuring systems in the voltage range of ± (1-100) kV | pilot | |
| 07.02.2026 | 813/RU-a/20 | Agreed | Supplementary comparison of measuring current transformers (CTs) | supplementary COOMET.EM-S25 |
|
| 03.12.2025 | 802/UZ-a/20 | Agreed | Pilot comparisons in the field of measuring DC and AC voltage and current, electrical resistance | pilot | |
| 07.06.2026 | 681/RU-a/16 | Agreed | Supplementary comparison of the measurement of current transformers (CTs) | supplementary COOMET.EM-S22 |
|
| 12.05.2026 | 624/GE-a/13 | Agreed | Comparison of electrical resistance standards at 100 Ω and 100 kΩ | supplementary COOMET.EM-S19 |
|
| 07.11.2025 | 862/RU-a/22 | Completed | Pilot comparisons of reference instruments measuring AC high voltage of power frequency | Pilot | |
| 21.06.2026 | 770/RU-a/18 | Completed | Supplementary comparisons of NMI measurement standards in the field of measurements of magnetic flux density of a permanent magnetic field and magnetic flux using sensing coils | supplementary COOMET.EM-S26 |
|
| 04.04.2026 | 798/BY-a/19 | Completed | Pilot comparisons of the volumes of digital information transmitted via the Internet and telephony channels | pilot |
L - Length
13projects.
from 14.03.2023: 0 - proposed; 0 - agreed; 0 - completed; 0 - excluded;
| actualisation | project number | state | subject | type of comparison | x |
|---|---|---|---|---|---|
| 23.09.2025 | 820/KZ/20 | Proposed | Comparison of interference devices for measuring tapes up to 20 m | supplementary | |
| 18.08.2025 | 810/RU-a/20 | Agreed | Supplementary comparisons of measurement standards of involute gears using a complex standard | supplementary COOMET.L-S30 |
|
| 13.01.2026 | 800/BY/20 | Agreed | Calibration of lengths of reference linear geodetic base lines | supplementary COOMET.L-S32 |
|
| 16.07.2026 | 776/RU-a/19 | Agreed | Supplementary comparisons of measurement standards in the field of measurement of 3D parameters of surface texture | supplementary COOMET.L-S28 |
|
| 25.08.2025 | 746/BY-a/18 | Agreed | Calibration of gauge blocks by interference method. | supplementary COOMET.L-S29 |
|
| 11.08.2025 | 742/UA-a/18 | Agreed | The comparison of length standards for measuring end measures in the range up from 0,5 mm to 100 mm. | supplementary COOMET.L-S27 |
|
| 11.08.2025 | 705/UA-a/16 | Agreed | Measurement of one-dimensional standard for coordinate measuring machines. | supplementary COOMET.L-S26 |
|
| 01.12.2025 | 690/RU-a/16 | Agreed | Comparisons of internal and external diameter gauges | key COOMET.L-K4.2021 |
|
| 12.03.2026 | 674/UA-a/15 | Agreed | Comparison of standards nanometer range | supplementary COOMET.L-S25 |
|
| 22.10.2025 | 612/BY-a/13 | Agreed | Calibration of a 200 mm linear glass scale | supplementary COOMET.L-S31 |
|
| 11.08.2025 | 591/UA-a/12 | Agreed | Comparisons of precise navigation systems GPS/GLONASS. | supplementary COOMET.L-S24 |
|
| 27.08.2025 | 590/UA-a/12 | Agreed | Comparison of precision rangefinders. | supplementary COOMET.L-S23 |
|
| 19.11.2025 | 524/UA-a/11 | Agreed | Key comparison of the national standards unit of the plane angle | key COOMET.L-K3 |
M - Mass And Related Quantities
15projects.
from 14.03.2023: 1 - proposed; 1 - agreed; 1 - completed; 0 - excluded;
| actualisation | project number | state | subject | type of comparison | x |
|---|---|---|---|---|---|
| 12.10.2025 | 892/RU/23 | Proposed | Supplementary comparisons in the field of mass measurements in the range from 1 mg to 5 kg | supplementary | |
| 16.06.2026 | 822/GE-a/20 | Agreed | Pilot comparisons in the small volumes | pilot | |
| 14.04.2026 | 789/KZ-a/19 | Agreed | Pilot comparisons of fluid density in the range of from 600 to 1000 kg/m3 | pilot | |
| 14.04.2026 | 788/KZ-a/19 | Agreed | Pilot comparisons of the unit kinematic viscosity of a liquid at temperatures: 20 °C (250-400 mm2/s), 25 °C (50-100 mm2/s), 40 °C (20-70 mm2/s) |
pilot | |
| 10.11.2025 | 766/GE-a/18 | Agreed | Supplementary comparisons in the small volumes | supplementary COOMET.M.FF-S7 |
|
| 30.08.2025 | 764/RU-a/18 | Agreed | Supplementary comparisons in the field of mass measurements | supplementary COOMET.M.M-S6 |
|
| 04.11.2025 | 717/DE-a/17 | Agreed | Supplementary comparisons of national standards of the pressure unit in the range from 250 MPa to 1500 MPa | supplementary COOMET.M.P-S3 |
|
| 16.05.2026 | 711/TR-a/16 | Agreed | Comparison of absolute pressure in the range 0,3 mPa to 0,9 Pa | key COOMET.M.P-K15 |
|
| 03.06.2026 | 694/MD-a/16 | Agreed | Supplementary comparison of mass standards with nominal values of 100 mg, 20 g, 1 kg and 10 kg | supplementary COOMET.M.M-S3 |
|
| 14.06.2026 | 665/UA-a/15 | Agreed | Supplementary bilateral comparison in the field of mass measurements | supplementary COOMET.M.M-S2 |
|
| 21.06.2026 | 651/RU-a/14 | Agreed | Supplementary bilateral comparison of national reference instruments for nanoindentation | supplementary COOMET.M.H-S2 |
|
| 28.01.2026 | 589/UA-a/12 | Agreed | Supplementary comparison of national measurement standards of gauge pressure in the range from 1 MPa to 10 MPa | supplementary COOMET.M.P-S1 |
|
| 14.06.2026 | 546/UA-a/11 | Agreed | Supplementary comparisons in the field of mass measurements | supplementary COOMET.M.M-S5 |
|
| 17.10.2025 | 259/RU/02 | Agreed | COOMET comparisons in the field of force measurements | supplementary COOMET.M.F-S1 |
|
| 16.06.2026 | 638/UA-a/14 | Completed | The comparison of the national hardness standards of Super-Rockwell scales. | supplementary COOMET.M.H-S3 |
F - Fluid Flow
3projects.
from 14.03.2023: 0 - proposed; 1 - agreed; 0 - completed; 0 - excluded;
| actualisation | project number | state | subject | type of comparison | x |
|---|---|---|---|---|---|
| 13.05.2026 | 852/RU-a/21 | Agreed | Supplementary comparisons of national standards in the field of gas flow and volume at gas flow rate from 0.4 to 100 m3/h | supplementary | |
| 05.11.2025 | 760/RU-a/18 | Agreed | Supplementary comparisons of national standards in the field of liquid flow and mass in the flow range from 0.1 to 45 t/h | supplementary COOMET.M.FF-S10 |
|
| 16.11.2025 | 545/UA-a/11 | Agreed | Comparisons of complex of static volume measuring devices | supplementary COOMET.M.FF-S6 |
PR - Photometry And Radiometry
11projects.
from 14.03.2023: 2 - proposed; 0 - agreed; 0 - completed; 1 - excluded;
| actualisation | project number | state | subject | type of comparison | x |
|---|---|---|---|---|---|
| 07.06.2026 | 878/RU/23 | Proposed | Wavelength of spectrally-selective transmitting material, from 250 nm to 2500 nm | supplementary | |
| 07.06.2026 | 877/RU/23 | Proposed | Spectral transmittance in the wavelength range from 380 nm to 1000 nm | key | |
| 05.03.2026 | 804/UZ/20 | Proposed | Pilot comparisons of measurement standards of attenuation and average power of a signal in optical fiber | pilot | |
| 16.01.2026 | 801/BY/20 | Proposed | Supplementary comparisons of measurement standards for polarization mode dispersion in optical fiber | supplementary | |
| 09.03.2026 | 785/RU-a/19 | Agreed | Supplementary comparisons of laser power responsivity at wavelengths of 0,532; 1,064 and 10,6 μm | supplementary COOMET.PR-S12 |
|
| 11.07.2026 | 781/UZ-a/19 | Agreed | Pilot comparison of spectral regular transmittance from 400 to 1000 nm | pilot | |
| 04.02.2026 | 741/RU-a/18 | Agreed | Spectral Irradiance, from 250 nm to 2500 nm | key COOMET.PR-K1.a.2018 |
|
| 18.11.2025 | 735/RU-a/17 | Agreed | Relative reflection density of samples | pilot | |
| 14.09.2025 | 640/BY-a/14 | Agreed | Comparison of colour, transmitted | supplementary COOMET.PR-S10 |
|
| 10.08.2025 | 429/CU-a/08 | Agreed | Comparisons of measurement standards of the units of spectral regular transmittance in the (250 to 900) nm wavelength range | supplementary COOMET.PR-S5 |
|
| 06.04.2026 | 805/UA/20 | Excluded | Supplementary comparison on spectrally-selective transmitting material | supplementary |
QM - Amount Of Substance
13projects.
from 14.03.2023: 3 - proposed; 3 - agreed; 1 - completed; 0 - excluded;
| actualisation | project number | state | subject | type of comparison | x |
|---|---|---|---|---|---|
| 06.11.2025 | 894/RU/23 | Proposed | Pilot comparisons in the field of measuring low gas permeability of rocks | pilot | |
| 22.12.2025 | 865/RU/22 | Proposed | Pilot comparisons in the field of sulfur and carbon mass fractions measurements in steel | pilot | |
| 22.12.2025 | 864/RU/22 | Proposed | Key comparisons "Automotive exhaust gases" | key | |
| 23.09.2025 | 849/RU/21 | Proposed | Content of metals in blood serum | pilot | |
| 24.10.2025 | 881/RU-a/23 | Agreed | Pilot comparisons in the field of measuring the nutritional value of soy flour | pilot | |
| 24.10.2025 | 880/RU-a/23 | Agreed | Pilot comparisons in the field of measuring the nutritional value of milk powder | pilot | |
| 24.10.2025 | 879/RU-a/23 | Agreed | Pilot comparisons in the field of measuring the nutritional value of chocolate | pilot | |
| 25.10.2025 | 809/RU-a/20 | Agreed | Pilot comparison in the field of measuring the mass fraction of titanium in pure titanium | pilot | |
| 25.10.2025 | 808/RU-a/20 | Agreed | Pilot comparison in the field of measuring the mass fraction of nickel in pure nickel | pilot | |
| 25.10.2025 | 807/RU-a/20 | Agreed | Pilot comparison in the field of measuring the mass fraction of magnesium in pure magnesium | pilot | |
| 25.10.2025 | 806/RU-a/20 | Agreed | Pilot comparison in the field of measuring the mass fraction of aluminum in pure aluminium | pilot | |
| 05.11.2025 | 775/RU-a/19 | Agreed | Pilot comparison on determination of KCl solution electrolytic conductivity at the level of 10 μSm/sm and 25 Sm/m | pilot | |
| 27.07.2026 | 824/RU/21 | Proposed | Pilot comparisons "Determination of sulfur in isooctane" | pilot |
RI - Ionizing Radiation
3projects.
from 14.03.2023: 0 - proposed; 0 - agreed; 0 - completed; 0 - excluded;
| actualisation | project number | state | subject | type of comparison | x |
|---|---|---|---|---|---|
| 30.03.2026 | 389/RU/07 | Proposed | Comparison of the well-type ionization chamber (IC) calibrations factors for the medical radionuclides ("Dosecalibrators"). | supplementary | |
| 30.04.2026 | 833/RU-a/21 | Agreed | Supplementary comparisons of the national standards of radioactivity | supplementary COOMET.RI(II)-S3 |
|
| 14.09.2025 | 641/BY-a/14 | Agreed | Comparison of the national standards of air kerma for x-radiation qualities used in radiation protection and diagnostic radiology | supplementary COOMET.RI(I)-S3 |
T - Termometry
11projects.
from 14.03.2023: 3 - proposed; 0 - agreed; 2 - completed; 0 - excluded;
| actualisation | project number | state | subject | type of comparison | x |
|---|---|---|---|---|---|
| 19.07.2026 | 890/KZ/23 | Proposed | Pilot comparisons of digital thermometers | pilot | |
| 27.06.2026 | 885/BY/23 | Proposed | Pilot comparisons in the field of calibration of glass thermometers | pilot | |
| 21.06.2026 | 882/RU/23 | Proposed | Comparisons of triple point of water cells | pilot | |
| 14.02.2026 | 873/RU/23 | Proposed | Comparisons in the field of measuring the combustion energy of pure organic substances | pilot | |
| 25.11.2025 | 851/RU/21 | Proposed | Supplementary comparisons of measurement standards of dew point temperature | supplementary | |
| 15.11.2025 | 826/MD-a/21 | Agreed | Supplementary comparisons of standards for relative humidity unit | supplementary COOMET.T-S5 |
|
| 07.10.2025 | 787/UZ-a/19 | Agreed | Pilot comparisons in the area of platinum resistance thermometers calibration | pilot | |
| 15.11.2025 | 771/MD-a/18 | Agreed | Pilot comparisons in the area of platinum resistance thermometers calibration in fixed points from triple point of mercury (-38.8344 °C) to melting point of gallium (29.7646 °C) | pilot | |
| 20.12.2025 | 704/RU-a/16 | Agreed | Comparisons of temperature national standards at the triple point of mercury. | key COOMET.T-K9.1 |
|
| 19.03.2026 | 744/RU-a/18 | Completed | Comparisons in the field of measurements of combustion energy of coals with different sulphur content | supplementary COOMET.T-S4 |
|
| 08.05.2026 | 780/RU-a/19 | Completed | Pilot comparisons of national reference gas calorimeters using samples of gas mixtures | pilot |
TF - Time and Frequency
2projects.
from 14.03.2023: 1 - proposed; 0 - agreed; 0 - completed; 0 - excluded;
| actualisation | project number | state | subject | type of comparison | x |
|---|---|---|---|---|---|
| 21.06.2026 | 883/UZ/23 | Proposed | Bilateral comparisons of the UTC (UME) Türkiye and UTC (UzNIM) Uzbekistan time scales will be carried out using the GNSS Common View Method | pilot | |
| 16.11.2025 | 398/RU-a/07 | Agreed | Key comparisons of national standards of time and frequency with the Russian UTC (SU) scale | key CCTF-K001.UTC |