ISO 9001 requires measuring equipment to be calibrated and traceable – but the standard does not fix exact intervals per instrument. You work risk-based: how critical is the measurement, how hard is the equipment used and what does the manufacturer say? Here are practical guidelines that work in audits in Nordic manufacturing and workshops.
What auditors want to see
- Register of measuring equipment with unique ID
- Calibration certificates or traceability to an accredited lab
- Rationale for the chosen interval (risk, use, history)
- Action if equipment is used without valid calibration
Recommended intervals (starting point)
| Instrument | Typical interval | Comment |
|---|---|---|
| Torque wrenches (critical) | 6–12 months | Shorter with heavy use or after drop |
| Micrometers, calipers | 6–12 months | Cleaning and storage affect stability |
| Multimeters, testers | 12 months | Verify before important jobs |
| Pressure gauges | 6–12 months | Depends on medium and wear |
Always adjust from your own history: if an instrument often fails calibration – shorten the interval.
Risk factors that shorten the interval
- Drops, impacts or repair without re-calibration
- Extreme temperature, dust, vibration (site, foundry)
- Measurement tied to customer approval or safety
Automate reminders
Excel and binders rarely scale past 50+ instruments. With calibration in Delatool you link equipment to tool ID, QR and reminders – same flow as service tracking. Avoid stopping production the week before an audit to chase certificates.