Legal Metrology Model Approval Under Section 22 in India

A Complete Guide to Legal Metrology Model Approval in India

For manufacturers and importers of weighing and measuring instruments, Legal Metrology Model Approval is one of the most important regulatory requirements to address before bringing a product into the Indian market.

Under Section 22 of the Legal Metrology Act, 2009, a person must seek approval of the model of a weight or measure before manufacturing or importing it, subject to the statutory exceptions and applicable rules.

The requirement is particularly important for businesses dealing with weighing machines, electronic weighing instruments, measuring instruments, petrol pumps, water meters, clinical thermometers, sphygmomanometers and other regulated equipment.

The Department of Consumer Affairs identifies model approval as a specific function under the Legal Metrology framework, and the Legal Metrology (Approval of Models) Rules, 2011 prescribe the procedure and technical requirements for obtaining approval.

For businesses planning to manufacture or import weighing and measuring equipment into India, understanding Legal Metrology Model Approval, Section 22 compliance, testing requirements and subsequent licensing is essential.

What Is Model Approval Under Section 22?

Section 22 of the Legal Metrology Act, 2009 provides that:

Every person, before manufacturing or importing any weight or measure, shall seek approval of the model of such weight or measure in the prescribed manner.

The approval is intended to establish that the model complies with the applicable standards and technical requirements under the Legal Metrology framework.

Importantly, model approval is not the same as Legal Metrology verification and stamping.

Model approval establishes conformity of the model.

Verification and stamping generally concern the individual instrument before it is put into use for transactions or protection, as applicable under the Act and Rules.

The Department of Consumer Affairs explains that Legal Metrology is intended to provide a public guarantee of accuracy and security in measurements and measuring instruments.

Why Is Legal Metrology Model Approval Required?

A weighing or measuring instrument used in commercial transactions must provide reliable and accurate measurement.

For example, consider:

• An electronic weighing scale used by a retailer
• A weighbridge used to determine the weight of commercial vehicles
• A fuel dispenser used at a petrol station
• A water meter used for billing
• A measuring instrument used in a commercial transaction

An inaccurate instrument can directly affect the amount paid or received by consumers or businesses.

Model approval therefore serves as an important pre-market conformity assessment mechanism.

The testing process can examine characteristics including:

• Accuracy
• Metrological performance
• Technical characteristics
• Robustness
• Reliability
• Performance under relevant conditions
• Protection against fraudulent use
• Verification and sealing arrangements

The Legal Metrology (Approval of Models) Rules, 2011 specifically provide for testing to assess conformity with applicable standards and metrological and technical characteristics.

Which Products Require Model Approval?

Model approval is applicable to weights and measures and weighing/measuring instruments covered by the Legal Metrology framework, including instruments prescribed under the Legal Metrology (General) Rules, 2011.

The Department of Consumer Affairs lists numerous regulated instruments, including electronic weighing instruments, weighbridges, petrol pumps, water meters, sphygmomanometers and clinical thermometers.

Depending on the specific product, the applicable Indian requirements and technical specifications must be examined before determining the approval route.

Examples of Products That May Require Model Approval

• Electronic weighing instruments
• Non-automatic weighing instruments
• Weighbridges
• Petrol/fuel dispensers
• Water meters
• Clinical thermometers
• Sphygmomanometers
• Certain measuring instruments
• Other notified weights and measures

Important: Model approval should not be assumed merely because a product performs a measurement function. Applicability depends on whether the particular instrument falls within the relevant Legal Metrology provisions and prescribed categories.

Is Model Approval Required Before Import?

Yes, as a general statutory requirement, Section 22 requires model approval before importing a regulated weight or measure, subject to applicable exceptions.

This is particularly important for foreign manufacturers and Indian importers.

An overseas manufacturer may have already obtained:

• CE certification
• OIML-related documentation
• ISO certification
• FCC certification
• Other international approvals

However, these documents do not automatically substitute for Indian Legal Metrology model approval.

Section 22 specifically addresses approval under India's Legal Metrology framework.

At the same time, the Act allows the prescribed authority, in appropriate circumstances, to approve a model already approved outside India where it conforms to the standards established under Indian law, with or without testing as considered appropriate.

Therefore, international approval documentation can be relevant, but the Indian regulatory route must still be established.

What Is the Difference Between Model Approval and Legal Metrology License?

This distinction is extremely important for manufacturers and importers.

Model Approval

Model approval concerns the technical and metrological conformity of the instrument/model.

Manufacturer/Importer Licence

A separate licensing framework applies to the manufacture or import of weights and measures.

The Legal Metrology (Approval of Models) Rules provide that before issuing a licence to manufacture or import a weight or measure, the State Government is to satisfy itself that a model approval certificate has been granted by the Central Government under Section 22.

In simple terms:

Model Approval → Applicable Manufacturer/Importer Licensing → Verification & Stamping → Lawful Use/Sale, as applicable

The exact compliance sequence can depend on the product and business activity.

Legal Metrology Model Approval Process in India

The model approval process involves technical evaluation rather than merely administrative registration.

Step 1: Determine Model Approval Applicability

The first step is to determine whether the product is covered by the Legal Metrology Act and applicable Rules.

This assessment should consider:

• Product type
• Measurement function
• Intended use
• Accuracy class
• Technical configuration
• Whether the instrument is used for transaction or protection
• Applicable Indian Standard/specification
• Applicable exemptions

This step is particularly important because the Department of Consumer Affairs has clarified that certain measuring instruments are presently outside the scope of Section 22 because they are not covered by the Legal Metrology (General) Rules, 2011.

For example, the Department's FAQ states that electronic calipers, digital calipers, bore gauges and certain similar instruments currently do not require model approval under Section 22 because they are not covered by the relevant Rules.

Therefore, businesses should perform a product-specific applicability assessment rather than relying on generic lists found online.

Step 2: Identify the Applicable Technical Requirements

Once applicability is established, the applicable technical requirements must be identified.

These may relate to:

• Accuracy
• Capacity
• Scale intervals
• Construction
• Display
• Measurement performance
• Environmental/influence factors
• Safety features
• Fraud-prevention mechanisms
• Verification and sealing arrangements

The applicable requirements depend on the category of instrument.

Step 3: Prepare the Technical Documentation

The Legal Metrology (Approval of Models) Rules, 2011 prescribe detailed information to accompany an application.

The application includes information such as:

• Applicant's name and address
• Manufacturer's details where the model is imported
• Dealer/importer details in India
• Description and classification of the instrument
• Intended use
• Metrological and technical characteristics
• Manufacturer's test procedure
• Trade/brand name
• Type of instrument

The Rules also prescribe supporting technical documents, including drawings, construction and operating information, safety devices, adjustment/correction arrangements, sealing locations, photographs, circuit diagrams for digital instruments, user manuals and other technical literature.

Step 4: Submit the Model for Testing

The model is submitted for testing through the prescribed process.

The Legal Metrology (Approval of Models) Rules provide for testing through recognized laboratories. Depending on the nature and size of the equipment, testing may be conducted at the laboratory or, where appropriate, at another location.

The applicant bears the relevant costs and must provide the facilities required for testing.

For large equipment such as certain industrial weighing systems, the physical size of the instrument can make conventional laboratory testing impractical, so the applicable testing arrangements need to be determined in advance.

Step 5: Technical Testing and Evaluation

The testing process evaluates whether the model meets the applicable standards.

The Rules state that testing may consider:

• Conformity with standards established under the Act and Rules
• Recommendations of the International Organization of Legal Metrology (OIML), where relevant
• Accuracy and maintenance of metrological characteristics
• Performance under different conditions
• Influence factors
• Mandatory declarations
• Sealing arrangements
• Robustness
• Reliability
• Susceptibility to fraudulent use

This is why the model submitted for testing must accurately represent the production configuration.

Step 6: Grant of Model Approval

After the testing process, the recognized laboratory submits its findings through the prescribed regulatory process.

Where the requirements are satisfied, a model approval certificate can be issued.

The approved model receives a designated code/mark, and the approval certificate contains information concerning the model, category, test results, special conditions and verification/sealing locations.

The Rules also provide for publication of model approval certificates on the Department's website.

What Happens If the Model Fails Testing?

A failed test does not necessarily mean that the product can never be approved.

The Legal Metrology (Approval of Models) Rules provide a mechanism for a disapproved model to be resubmitted after necessary modifications.

However, a resubmitted disapproved model is treated as a fresh application for the purposes of applicable testing and fees.

This is why technical pre-assessment before submitting the physical model can be valuable.

Important 2026 Update for Importers: Recognition/Endorsement of Already Approved Models

Importers should also be aware of a significant development published by the Department of Consumer Affairs in July 2026.

The Department's current Latest News section lists an SOP for Recognition/Endorsement of an already Approved Model of Weights for Importers, published on 14 July 2026.

This is particularly relevant to importers whose overseas products correspond to models that have already received approval within the Legal Metrology framework.

The development is important because businesses should no longer assume that every import situation necessarily follows an identical fresh-testing pathway. The appropriate procedure should be determined from the current Departmental SOP and the facts of the particular model/import arrangement.

For an importer, this makes it especially important to check:

• Whether the model is already approved
• Whether the imported model is technically identical to the approved model
• Whether the importer qualifies for the applicable recognition/endorsement process
• What documentation is required
• Whether testing is required in the particular case

A professional applicability assessment can help determine the correct route before shipment.

What Information Is Important for Imported Instruments?

For imported weighing and measuring instruments, businesses should maintain consistency between:

• Manufacturer details
• Indian importer/dealer details
• Brand name
• Model number
• Technical specifications
• Capacity
• Accuracy class
• Software/firmware configuration, where relevant
• Drawings
• Test reports
• Product photographs
• User manuals
• Approval documentation

Even a technically compliant product can encounter regulatory difficulties if the documentation does not clearly correspond to the physical instrument.

Model Approval for Electronic and Digital Weighing Instruments

Electronic weighing instruments require particular attention because their compliance assessment can involve both metrological and electronic characteristics.

Technical documentation may include:

• Circuit diagrams
• Display specifications
• Load cell information
• Software/firmware information where relevant
• Power supply details
• Accuracy specifications
• Capacity and verification scale interval
• Sealing arrangements
• Fraud-prevention mechanisms

The Rules specifically require an actual circuit diagram for digital types as part of the model approval documentation.

Common Reasons for Model Approval Delays

Businesses often experience delays because of preventable technical or documentation problems.

1. Incorrect Product Classification

The applicant may select an inappropriate category or technical standard.

2. Incomplete Drawings

The submitted drawings may not sufficiently represent the finished instrument.

3. Inconsistent Model Numbers

The model number on the test sample, application and technical documents may differ.

4. Incomplete Technical Data

Important metrological characteristics may be missing.

5. Non-Compliant Test Results

The physical model may fail one or more applicable technical requirements.

6. Inadequate Sealing Arrangements

The instrument may not provide appropriate protection against unauthorized adjustment or fraudulent use.

7. Product Changes After Approval

Manufacturers may change components, construction, software or technical characteristics without assessing whether the change affects the approved model.

Model Approval vs Verification and Stamping

These terms are often used interchangeably, but they represent different compliance stages.

The Department of Consumer Affairs has specifically clarified, for example, that certain high-accuracy weighing machines are verified and stamped at the place of installation before being put into use, rather than necessarily before customs clearance.

This demonstrates why businesses should not treat model approval, customs clearance and verification as interchangeable regulatory steps.

Are There Exemptions from Model Approval?

Yes.

Section 22 itself contains specified exceptions. These include certain:

• Cast iron weights
• Brass weights
• Bullion weights
• Carat weights
• Beam scales
• Certain length measures
• Certain capacity measures not exceeding 20 litres used in specified retail trade

The statutory language and applicable rules should be checked for the precise scope of each exemption.

The Legal Metrology (Approval of Models) Rules also contain provisions dealing with weights and measures for which model approval is ordinarily not necessary.

Important: An exemption from model approval does not automatically mean that the product is free from every other Legal Metrology requirement.

Other requirements, including applicable licensing, verification, stamping, or restrictions on manufacture/sale/use, may still need to be considered.

Can Internationally Approved Models Be Accepted in India?

Potentially, yes.

Section 22 contains a provision allowing the prescribed authority to approve a model that has already been approved in a foreign country if it conforms to the standards established under Indian law. The authority may approve it without testing or after such testing as it considers appropriate.

This is particularly relevant for multinational manufacturers.

However, foreign approval should not be treated as an automatic Indian approval.

The Indian authority must still be satisfied regarding conformity with Indian standards and requirements.

Model Approval Compliance Checklist for Manufacturers and Importers

Before applying for Legal Metrology Model Approval, businesses should verify:

Product Assessment

• Is the product covered by the Legal Metrology framework?
• Is Section 22 applicable?
• Does an exemption apply?
• What is the intended use of the instrument?

Technical Compliance

• Applicable Indian requirements identified
• Accuracy and capacity confirmed
• Metrological characteristics documented
• Sealing arrangements reviewed
• Fraud-prevention mechanisms evaluated

Documentation

• Manufacturer details
• Importer/dealer details
• Product drawings
• Technical specifications
• Circuit diagrams, where applicable
• Product photographs
• User manual
• Test procedure
• Technical literature

Importer-Specific Review

• Existing Indian model approval checked
• 2026 recognition/endorsement SOP reviewed where applicable
• Manufacturer and importer details aligned
• Model identity confirmed
• Applicable licence requirements assessed

How Om Garuda Group Helps with Legal Metrology Model Approval

Obtaining Legal Metrology Model Approval in India requires coordination between technical documentation, laboratory testing and regulatory procedures.

Om Garuda Group provides end-to-end support to manufacturers, importers and international brands dealing with regulated weighing and measuring instruments.

Our assistance includes:

Model Approval Applicability Assessment

We review the product and determine whether Section 22 model approval is applicable.

Technical Documentation Review

We assist in reviewing:

• Technical specifications
• Drawings
• Circuit diagrams
• Product photographs
• User manuals
• Metrological characteristics
• Manufacturer documentation

Testing Coordination

We assist with coordination for the applicable model-testing process through the relevant recognized laboratory.

Application Preparation and Filing

Our team assists with preparation and submission of the model approval application and supporting documents.

Regulatory Follow-Up

We coordinate the regulatory process and assist with responses to technical or documentation queries.

Import Compliance

For overseas manufacturers and Indian importers, we also help assess the relationship between:

Model Approval + Importer Licensing + Verification + Stamping + Customs/Market-Entry Requirements

2026 Model Recognition/Endorsement Support

Where an importer may be eligible for the Department's current process concerning recognition/endorsement of an already approved model, we can assist in assessing the applicable route and documentation.

With 6+ years of regulatory experience and 1000+ successful projects, Om Garuda Group supports businesses in navigating India's Legal Metrology and broader product-compliance requirements.

Conclusion

Model Approval under Section 22 of the Legal Metrology Act, 2009 is a critical pre-market compliance requirement for applicable weighing and measuring instruments.

It is designed to ensure that regulated instruments manufactured or imported into India conform to prescribed metrological and technical requirements before entering commercial use.

For manufacturers and importers, compliance does not end with obtaining a model approval certificate. Businesses should also evaluate applicable licensing, verification, stamping, labeling and ongoing Legal Metrology obligations.

The regulatory landscape is also evolving. In 2026, the Department of Consumer Affairs has published an SOP concerning recognition/endorsement of already approved models of weights for importers, making it even more important for importers to determine the correct compliance route before bringing equipment into India.

Need Legal Metrology Model Approval in India?

If you are planning to manufacture or import weighing machines, weighing instruments, measuring equipment, fuel dispensers, water meters or other regulated weights and measures, Om Garuda Group can help you assess applicability and manage the compliance process from documentation through approval.

Contact Om Garuda Group for Legal Metrology Model Approval, LMPC Registration, Importer Licensing and end-to-end regulatory compliance support in India.