Knowledge Centre

Categories of Measuring Instruments

The table below shows the measuring instrument categories that are included in the OIML-CS, along with the corresponding OIML Recommendations. It also shows the Scheme (A or B) for each measuring instrument category and the transition date from Scheme B to Scheme A.

Measuring Instrument Category
Recommendation Number

Scheme

A             B

Transition from Scheme B to Scheme A
Sphygmomanometer
R 16
X

1 January 2021
Taximeters
R 21
X
1 January 2021
Material Measures of Length
R 35
X

1 January 2021
Active electrical energy meters
R 46
X

Water meters
R 49
X

Continuous totalizers
R 50
X
1 January 2021
Automatic catchweighers
R 51
X

Sound Level Meters
R 58
X

1 January 2021
Moisture meters for cereal grains and oilseeds
R 59
X

1 January 2021
Load cells
R 60
X
Automatic gravimetric filling instruments
R 61
X
1 July 2020
Heat meters
R 75
X
1 January 2021
Non-automatic weighing instruments
R 76
X
Cryogenic Liquids
R 81
X

1 January 2021
Level gauges for stationary storage tanks
R 85
X
1 July 2020
Integrating-averaging Sound Level Meters
R 88
X

1 January 2021
Focimeters
R 93
X

1 January 2021
Vehicle exhaust emissions
R 99
X
1 January 2021
Sound Calibrators
R 102
X

1 January 2021
Pure-tone Audiometers
R 104
X

1 January 2021
Automatic rail-weighbridges
R 106
X
1 January 2021
Discontinuous totalizers
R 107
X
1 January 2021
Pressure Balances
R 110
X

1 January 2021
Liquids other than water
R 117
X

Speech Audiometry
R 122
X

1 January 2021
Evidential breath analyzers
R 126
X
1 January 2021
Ergometers for foot crank work
R 128
X

1 January 2021
Multi-dimensional measuring instruments
R 129
X
1 July 2020
Liquid-in-glass thermometers
R 133
X

1 January 2021
Weighing road vehicles in motion
R 134
X
1 January 2021
Areas of Leather
R 136
X

1 January 2021
Gas meters
R 137
X

Compressed gaseous fuel systems for vehicles
R 139
X
1 January 2021
Continuous measurement of SO2 in stationary source emissions
R 143
X

1 January 2021
Continuous measurement of CO, NOx in stationary source emissions
R 144
X

1 January 2021
Ophthalmic instruments – Impression and applanation tonometers
R 145
X

1 January 2021
Protein measuring instruments for cereal grains and oilseeds
R 146
X

1 January 2021

 

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    OIML

    “The mission of the OIML is to enable economies to put in place effective legal metrology infrastructures that are mutually compatible and internationally recognized, for all areas for which governments take responsibility, such as those which facilitate trade, establish mutual confidence and harmonize the level of consumer protection worldwide.”