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Range: -40 °C to +100 °C
NPL calibrates thermometers for use in air, both those incorporated within relative humidity instruments and those used purely for air temperature measurement. These calibrations are performed in air, within a temperature-controlled chamber, by comparison against reference thermometers with traceability to national standards.
Calibration in the NPL laboratory Range: -40 °C to +100 °C Best uncertainty: ±0.04 °C between -20 °C and +50 °C (at other values: ±0.08 °C)
Calibration above atmospheric pressure in other gases
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