What is Legal Metrology Model Approval?
Under Section 22 of the Legal Metrology Act, 2009 and the Legal Metrology (Approval of Models) Rules, 2011, no person or enterprise can manufacture or import any weight or measure instrument in India without obtaining prior Model Approval from the Central Director of Legal Metrology (Ministry of Consumer Affairs).
The model approval verifies that the measuring device conforms to statutory accuracy tolerances, temperature resistance, anti-tamper sealing, and metrological standards (OIML guidelines). Following Model Approval, the equipment must undergo periodic verification and stamping by the State Legal Metrology Inspector.
Testing in RRSL / NPL
Sample testing in National Physical Laboratory (NPL) or Regional Reference Standards Laboratories (RRSL).
State Dealer / Manufacturer Licenses
Assistance for State LM-1 (Manufacturer), LD-1 (Dealer), and LR-1 (Repairer) licensing across all Indian states.
Instruments Requiring Section 22 Model Approval
All commercial, industrial, clinical, and trade measuring devices require model approval:
Electronic Weighing Scales
Tabletop, platform, jewel scales, weighbridges, crane scalesFuel Dispensing Units
Petrol/diesel flow meters, CNG dispensers, LPG mass flow metersWater & Flow Meters
Domestic water meters, ultrasonic meters, electromagnetic flow metersClinical Instruments
Digital thermometers, Sphygmomanometers (BP monitors), infant scalesFrequently Asked Questions
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