Model Approval Certificate

A Model Approval Certificate is required before a weighing or measuring instrument model (weighbridges, scales, fuel dispensers, etc.) can be manufactured or sold in India, verifying the design meets Legal Metrology accuracy and construction standards.

Model approval exists to verify an instrument's design is inherently capable of accurate, tamper-resistant measurement before it's ever manufactured at scale — catching design-level accuracy or construction issues once, rather than relying solely on catching problems unit by unit after production.

Model approval is a design-level check, distinct from the unit-level verification and stamping every individual instrument still needs before sale (covered separately under Weight & Measurement Dealer licensing). Once a model is approved, every unit manufactured to that exact design can proceed to individual verification without repeating the full design review — which is why manufacturers typically seek model approval before committing to a production run, not after.

Type testing evaluates accuracy across the instrument's full rated range and under conditions meant to simulate real-world use (temperature variation, repeated loading, tampering resistance for sealed components), rather than a single accuracy check at one load point — so the test house and testing scope matter as much as the design documentation itself.