A legal-for-trade scale, if you price by weight

Only matters if you charge by weight — by the pound or kilo at the counter or market table. Then the scale must be a “legal for trade” model, the kind sold for retail use with a Measurement Canada approval number, rather than a kitchen scale, and a private service company checks it every five years. It sits level, faces the customer and is zeroed, and packaging isn’t charged. Food sold by the piece, or in packs that all weigh the same, doesn’t need one; neither does portioning a burger patty.