Guide9.5
Calibration requirements
| Item | Requirement |
|---|---|
| Reference weights | OIML Class E2 or F1, with tight tolerances so the weight does not introduce its own error. |
| Traceability | Weights certified by a NATA or other ILAC-recognised accredited laboratory, so the calibration is defensible at audit. |
| Environment | Free from dust, vibration, static and temperature swings; for example 20 ± 2 °C and 45–55% RH. |
| Tools | Soft brush, lint-free cloth, tongs or tweezers, printer, balance SOP and weight certificates. |
| Calibration report | Date and time, balance ID, model and serial number, applied versus found weight at zero and span, error, and pass/fail. |
| Precautions | Never touch weights with bare hands; follow the SOP and manufacturer’s instructions; keep all records. |
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