Open Access
Review
Table 3
Best accuracies today attainable for main parameters.
| Quantity | Unit | Attainable uncertainty |
|---|---|---|
| Time/frequency | Second/hertz | 10−13 |
| Length | Metre | 3 × 10−11 |
| Mass | Kilogram | 5 × 10−9 |
| Voltage* | Volt | 10−10 |
| Current | Ampere | 10−7 |
| Resistance | Ohm | 5 × 10−10 |
| Capacity | Farad | 10−6 |
| Inductance | Henry | 2 × 10−6 |
| Temperature | Kelvin | 10−8 |
| Luminosity | Candela | 1.5 × 10−2 |
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