Choosing a precision balance
Why 0.01g is essential for weighing your metals.
At a glanceIn precious metals trading and jewelry workshops, a certified precision scale is the core legal instrument. A weighing error of just 0.1 gram on pure gold equates to dozens of francs. This guide details Swiss legal metrology rules under METAS, accuracy classes, and calibration standards.
Legal Metrology Classes in Switzerland (METAS)
Swiss federal legislation categorizes scales into four accuracy classes based on OIML guidelines:
| Class | Verification Interval ($d$) | Approved Application | Legal Trade Verification |
|---|---|---|---|
| Class I (Special Precision) | 0.0001 g (0.1 mg) | Official assay laboratories, cupellation analysis | Mandatory (Green 'M' sticker) |
| Class II (High Precision) | 0.01 g (10 mg) or 0.001 g | Bullion counters, jewelers, bank branches | Mandatory for commercial trade |
| Class III (Medium Accuracy) | 0.1 g to 1 g | Postal scales, package weighing | Prohibited for retail gold trade |
| Unverified Scales | Variable | Cheap generic pocket scales | Prohibited for commercial buybacks |
3 Hallmarks of a Legal Commercial Weighing in Switzerland
1. Official METAS Verification Sticker: Sealed cantonal inspection label proving annual verification.
2. Glass Draft Shield: Prevents air currents from falsifying measurements at 0.01g resolution.
3. Customer-Facing Display: The customer must be able to view the display clearly throughout the transaction.
Frequently Asked Questions (FAQ): Gold Scales
Can I use a kitchen scale to check my gold?
No. Kitchen scales carry a margin of error of ± 1 to 2 grams, which is completely unsuited for precious metals.
What is an F1 calibration weight?
A certified non-magnetic stainless steel test weight used to calibrate the scale before trade sessions.
Buy Investment Gold in Switzerland (VAT-Exempt)
Buy and store physical gold in secure Zurich or Geneva vaults at direct live LBMA spot rates.