When exporting to the EU market, many instrument manufacturers ask: “My instrument/meter needs CE marking for export to the EU – does it also have to comply with the MID (Measuring Instruments Directive)?”
In fact, EU CE-MID certification applies only to specific categories of “legal metrology instruments”. If a company gets the scope wrong, it not only wastes compliance costs but may also choose the wrong certification route.
Today we systematically review the key points of this directive.
1. What is the CE-MID Directive?
The MID (Measuring Instruments Directive 2014/32/EU) is the EU’s core legislation on measuring instruments. It requires any instrument used for trade settlement, public measurement, tax or law enforcement purposes to undergo assessment by a notified body and bear the CE-MID marking before it can be sold on the EU market.
The aim of the MID is: “to ensure that all instruments used for commercial transactions and public measurement throughout the EU have consistent accuracy and fairness.”
2. The 10 categories of instruments covered by the MID
The MID is divided into 10 categories (MI-001 to MI-010), each with its own technical requirements and test standards.
All of these devices have one thing in common: their measurement results affect transaction amounts or the public interest.
3. Main test standards and assessment routes for MID certification
The MID requires manufacturers to undergo conformity assessment by a notified body, including review of design documentation and regular annual factory inspections. Common certification routes include:
Commonly used test standards include:
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EN 50470-1 / EN 50470-3 (electricity meters)
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EN 14154 (water meters)
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EN 45501 (weighing instruments)
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EN 12405 (gas volume conversion devices)
An MID-certified instrument’s rating plate shows:
the CE marking, the M plus year code (e.g. 2018), and the notified body number.
4. A common misconception: laboratory measurement ≠ legal metrology
In our consulting work we often hear laboratory instrument manufacturers ask: “Our product has a measurement function – does it also need MID certification?”
The answer is usually – no.
The MID applies only to instruments in the field of “legal metrology”. The following laboratory or industrial measuring equipment usually falls under “non-legal metrology” and is not covered by the MID:
In other words:
The MID covers “instruments used for charging”; it does not cover “instruments used for research”.
5. How to quickly determine whether a product falls within the scope of the MID
Companies can use the following three-step test:
1. Function: does the product provide a measurable result (with units such as kWh, m³, L)?
2. Purpose: does the measurement result directly affect transaction amounts or public billing?
3. Regulatory reference: is it brought within legal metrology by local regulations or customer requirements?
If the answer to all three is “yes”, the product most likely falls under the MID; otherwise, it only needs to meet ordinary CE requirements (LVD/EMC/RED/RoHS, etc.).
6. Summary: know the boundaries and don’t waste money on compliance
If your instrument is used for research, analysis, production control or internal testing, and not for trade billing, it is outside the scope of the MID.
Correctly distinguishing MID from non-MID products not only saves certification costs but also avoids the compliance risks of misusing the CE marking.
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