Weights-and-measures-hero

How do you know if your supermarket's scales are really accurate? We look at the weights and measures system that keeps traders honest.

We buy lots of goods by either weight or volume: petrol or diesel by the litre at the pump, and many items by weight at the supermarket.

A system administered by the Ministry of Consumer Affairs' Measurement and Product Safety Service (MAPSS) keeps everything honest.

Highlights of this report


The MAPSS weights and measures system


How the accuracy of measuring devices is maintained Read more

Does the system work?


We checked to see if the system was working Read more

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