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Calibration and Legal Verification of Scales

Scale Calibration and Verification (UK Regulations)

Calibration of Scales

Scales should be regularly adjusted and calibrated to ensure accurate weighing. The frequency depends on the type of scale, its usage, and industry-specific requirements. In the UK, “Legal for Trade” scales must undergo verification, which involves inspection, testing, and certification by a Trading Standards inspector or an approved verifier.

Once verified, the scale receives a seal or stamp. If the seal is broken due to repair or tampering, the scale must be re-verified.

Self-Adjustment

For non-trade or private use, scales may be adjusted using calibration weights. For trade or legal use, only certification through formal verification is acceptable.

Verification of Scales

Verification is legally required under the Weights and Measures Act 1985 for scales used in:

  • Commercial transactions and selling by weight
  • Pricing based on weight (taxes, fees, fines)
  • Legal measurements used in court
  • Medical applications (e.g. patient weighing)
  • Pharmaceutical compounding and laboratory analysis
  • Retail packaging and direct sales

These scales must be tested and approved by Trading Standards or an approved verifier, and stamped accordingly.

Enforcement

Local Trading Standards offices enforce compliance, perform inspections, and provide guidance on suitable weighing equipment.

Metrication and Labelling

UK law requires metric units (grams, kilograms, litres) for trade. Imperial units may only be displayed as supplementary information in a smaller font.

Summary Table

Requirement Details
Calibration Recommended for accuracy; self-adjustment allowed for non-trade use.
Verification (Legal for Trade) Mandatory certification with stamping/sealing by Trading Standards or approved verifier.
Seal Integrity Re-verification required if seal is broken or adjustments are made.
Enforcement Compliance managed by local Trading Standards authorities.
Units Metric units required; imperial only as supplementary indicators.
Business Impact: If your scales are used in trade, medical, or legal contexts, they must be verified by Trading Standards or an approved verifier. Re-verification is required if seals are broken. Self-calibration is valid only for internal, non-trade use.