If you manufacture and pack products in the UK, the Weights and Measures Act 1985 affects your business.
It applies to all industries that sell goods by weight or volume, food, pet food, chemicals, cosmetics, hardware, agriculture, construction materials and more.
Whether you run a semi-automatic filler or a fully automated packing line, your equipment must produce packs that meet legal weight requirements.
This guide explains:
-
What the Act is
-
Why it matters
-
What happens if you break the law
-
What the ℮ (E mark) means on packaging
-
How compliant packing machinery protects your business
What Is the Weights and Measures Act?
The Weights and Measures Act 1985 sets the legal standards for how goods are weighed, measured and sold in the UK.
Its purpose is simple: fairness and accuracy in trade.
For manufacturers, this means:
-
Products must contain the quantity stated on the label
-
Weighing equipment must be suitable for trade use
-
Equipment must be accurate and properly maintained
-
Trading Standards can inspect your machinery and packed goods
The law works alongside the Packaged Goods Regulations 2006, which govern the “average system” of packing.
Why This Law Is Important for All Manufacturers
No matter your industry, inaccurate packing can cause serious problems.
1. Protects Your Customers
Underfilled products mislead buyers. Overfilled products cost you money.
2. Protects Your Reputation
Retailers and distributors expect compliance. Consistent errors can damage contracts.
3. Prevents Legal Action
Local authority Trading Standards officers can inspect your premises and equipment.
What Happens If a Business Breaks the Law?
Here are real-world examples of what non-compliance might look like:
❌ Example 1: Underweight Products
A snack manufacturer labels packs as 500g. Random inspection finds many packs at 470g.
Result:
-
Formal investigation
-
Product recall
-
Fines
-
Damaged retailer relationships
❌ Example 2: Non-Trade Approved Scales
A company uses basic warehouse scales not verified for trade use.
Result:
-
Equipment seized or prohibited from use
-
Immediate requirement to replace machinery
-
Potential prosecution
❌ Example 3: Poor Process Control
A filling machine drifts out of calibration. No checks are recorded. Average batch weight falls below legal tolerance.
Result:
-
Enforcement notice
-
Mandatory corrective action
-
Risk of prosecution
Penalties can include fines and, in serious cases, criminal prosecution. More importantly, the cost of reputational damage can far exceed the fine.
What Does the ℮ (E Symbol) Mean on Packaging?
You’ve likely seen a small ℮ symbol next to the weight mark on packaging.
This is called the estimated sign (E mark).
It shows that the product complies with European average quantity rules under the EU Directive 76/211/EEC.
What the ℮ symbol means:
-
The manufacturer uses the average system of quantity control
-
Batches are monitored to meet strict statistical rules
-
Very few packages can fall below a defined tolerance
-
The average quantity must meet or exceed the stated weight
Why It’s Important
-
It allows goods to be sold across the UK and EU
-
Retailers expect it on many prepacked goods
-
It shows professional weight control processes are in place
However, you can only apply the ℮ mark if your packing system genuinely meets the required standards.
How Compliant Packing Machinery Protects Your Business
Accurate machinery is your first line of defence.
Modern packing and filling systems should provide:
✔ Precision Filling
Consistent, repeatable target weights.
✔ Integrated Check weighing
Automatic rejection of under- or overweight packs.
✔ Process Monitoring
Clear data records to demonstrate compliance.
✔ Reliable Calibration
Stable performance over long production runs.
How Scayl Supports Weights and Measures Compliance
Scayl specialises in:
-
Packing and filling machines
-
Multihead weighing systems
-
Checkweighers
-
Fully automated packing lines
Scayl’s systems are designed for commercial production environments where accuracy, repeatability and compliance are essential.
By integrating precision weighing technology into automated packing lines, manufacturers can:
-
Reduce giveaway
-
Prevent underweight batches
-
Maintain retailer confidence
-
Support ℮ mark requirements
-
Prepare confidently for Trading Standards inspections
Final Thoughts
The Weights and Measures Act is not just a legal requirement, it’s a foundation of fair trade.
For manufacturers across all industries, compliant weighing and packing systems protect:
-
Your customers
-
Your contracts
-
Your brand reputation
-
Your bottom line
Investing in accurate, reliable packing machinery is one of the simplest ways to reduce risk and demonstrate compliance.
If you want to ensure your packing line meets modern weight control standards, Scayl can help you build a solution designed for precision, performance and peace of mind.