Table 1
Results of the metrological analysis of testing standards to be accrediteda.
| Metrological quantity | Critical equipment | Min and max values to be measured or programmed | Resolution | Tolerance |
|---|---|---|---|---|
| Temperature | Incubator | 25–55 °C | – | ±1.0 °C |
| Autoclave | Programmed at 121 °C for 15 min | – | ±3.0 °C | |
| Refrigerator | 3–5 °C | – | 3 ± 2 °C 5 ± 3 °C |
|
| Water bath | 37–100 °C | – | ±1.0 °C | |
| Mass | Balanceb | Unless otherwise stated, the resolution of the balance should achieve a tolerance of 1% but shall be sufficient to achieve a maximum tolerance of 5% of the mass. | ± 2 mg | |
| pH | pH meter d | – | Capable of being read to the nearest 0.01 pH unit at 25 °C | ± 0.1 pH unit |
| Volume | Graduated pipettes 0.1 ml 2 ml 10 ml |
Different capacities: | Graduated 0.01 ml Graduated 0.1 Graduated 0.5 |
* For the 1 ml pipette, a standard specifies “class A” . * Another requirement: Maximum permissible tolerance should be within 2% for dispensing decimal dilution volumes and inocula (to improve precision and to reduce the uncertainty of the final test result, a maximum permissible tolerance of ± 2% is preferable) or 5% for other applications. |
Table 1 has been established by analyzing the nine testing standards cited in Section 2.3. In the “normative references” section of each of these standards, a certain number of standards are cited as essential for the application of the standard under study. Given the large number of these standards, we decided, in this paper, to present, in addition to the results of the analysis of the nine testing standards, the results of the analysis of the two that are common to all nine standards studied, namely ISO 7218 [27] and ISO 6887-1 [28].
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