Do you need a legal-for-trade scale at a farmers' market in Canada?
If you are selling food or other goods by weight in Canada, the scale used for the transaction must be legal for trade. Measurement Canada requires these scales to be approved, certified, and inspected at the required interval. For food sold by weight, the current general rule is inspection every 5 years. Using a non-compliant scale to complete a sale is a violation of the Weights and Measures Act.
What "Legal for Trade" Means in Canada
In Canada, the Weights and Measures Act governs how goods are measured in commercial transactions. A scale that is "legal for trade" is one that has been formally approved by Measurement Canada for use in buying and selling goods by weight.
This is different from a general-purpose or laboratory scale. A legal-for-trade scale must meet specific accuracy and construction standards, carry an official approval mark, and have been certified by an authorized service provider before it is put into use.
Approved — The scale model is tested and listed by Measurement Canada as an approved type.
Certified — Your specific unit is inspected and certified before it enters service.
Inspected — Re-inspected on schedule (every 5 years for most market scales) and a valid sticker is affixed.
When a Farmers' Market Vendor Needs a Compliant Scale
The requirement applies any time the price of a transaction is determined by weight. Common examples at farmers' markets include:
- Selling produce by the pound or kilogram
- Pricing meat, poultry, or fish by weight
- Selling honey, jam, or other packaged goods where the quantity is determined at point of sale
- Weighing baked goods sold loose
- Any bulk dry goods (grains, nuts, spices) sold by weight
If you are selling items at a flat rate per unit — a single pie, a dozen eggs, a bunch of flowers — and weight does not determine the price, you may not need a legal-for-trade scale for those specific transactions. When in doubt, contact Measurement Canada directly.
Measurement Canada also provides guidance specifically for farmers' markets, reminding both vendors and shoppers to look for a valid inspection sticker on any scale used for a sale.
How to Check Whether a Scale Is Compliant
A compliant scale will have visible markings and a sticker. Here is what to look for before your next market day:
Inspection sticker — An official Measurement Canada sticker with a visible date confirming it has been inspected within the required period.
Approval mark — A mark on the scale itself indicating the model type is on the Measurement Canada approved devices list.
Certification documentation — Records from an authorized service provider confirming the unit was certified when first put into service.
If a sticker is missing, expired, or the scale does not carry an approval mark, it should not be used for trade until re-inspected and certified by an authorized service provider.
Common Mistakes Vendors Make
These are the most frequent compliance errors found at Canadian farmers' markets — and the easiest to avoid with the right information.
- Using a kitchen or postal scale Retail scales are not approved for trade regardless of how accurate they appear. Only Measurement Canada approved models may be used.
- Assuming a new scale is automatically certified Approval and certification are separate steps. A new scale must be certified by an authorized service provider before it enters service.
- Letting the inspection sticker lapse Many vendors don't schedule re-inspection until after the market season starts. Book ahead — inspection slots fill up in spring.
- Using a scale approved in another country A scale approved for trade in the US or EU has not necessarily been approved by Measurement Canada. Approval must be specific to Canada.
- Not having documentation at the stall Market organizers or inspectors may ask to see certification records. Keep a copy with your market kit.
- Assuming the market organizer handles compliance Compliance is the individual vendor's responsibility. The market is not liable if your scale is non-compliant.
What Type of Scale Is Best for Your Market Stall?
The right scale depends on what you're selling. All recommendations below assume Measurement Canada approval and valid certification.
Produce — Vegetables, Fruit, Bulk Items
A mid-capacity platform scale with a stainless or painted steel platform is standard. Look for waterproof or splash-resistant construction to handle wet produce. A minimum capacity of 15 kg covers most single-item produce sales.
Meat, Poultry, Fish
Higher-capacity scales with sealed construction are preferred to handle cleaning and moisture. Label-printing capability can speed service at busy stalls and reduces disputes over the weight quoted.
Honey, Jams, Baked Goods
Smaller capacity scales (up to 3–6 kg) with fine resolution (2 g or better) suit small-batch artisan goods. Portability matters here — the scale may need to move between weighing area and display.
Dry Goods — Grains, Nuts, Spices
A compact bench scale with a scoop or bowl works well for loose dry goods. Look for a tare function so you can zero out the container weight quickly between customers.
Adam SWZ Farmers' Market Scale
Measurement Canada approved. Designed for outdoor market use with a durable stainless platform, large backlit display, and battery operation for stalls without power access. Available with initial certification.
View Scale Collection →How to Get Help With Inspection and Service in Canada
Scale inspection and certification must be carried out by an authorized service provider — a company or technician that Measurement Canada has authorized to inspect and certify weighing devices for trade.
Measurement Canada maintains a searchable directory of authorized service providers across Canada. Use the official tool below to find a provider in your province, or contact us directly — we can help connect vendors with inspection services and pre-certified scales in select regions.
The Measurement Canada directory is searchable by province and device type. Look for providers listed under "Weighing Devices."
Frequently Asked Questions
Direct answers to the most common compliance questions from Canadian market vendors.
Official Resources
Official Measurement Canada guidance for vendors and shoppers.
Official guidance on legal requirements for selling food by weight in Canada.
↗ Read guidanceMeasurement Canada's specific guidance for farmers' market vendors and consumers.
↗ Read guidanceUse this official form to report a suspected measurement violation at a market or food retailer.
↗ Report a concern