The standards maintained by NPL provide the UK reference for humid air mixing ratio, dew point, relative humidity and related quantities. These humidity calibrations provide measurement traceability to sectors such as pharmaceuticals, medical devices, electronics, instrumentation, power generation, telecommunications and precision engineering, as well as for general calibration and testing laboratories.

NPL can calibrate diverse humidity instruments, including relative humidity sensors, dew-point hygrometers, psychrometers, spectrometers, humidity generators, climatic chambers and others. Calibrations of air temperature sensors are also provided.  Mobile facilities enable NPL to carry out humidity calibrations or measurements at customer premises.  We continue to develop and extend our capabilities according to demand.

NPL also provides a highly regarded humidity training course; humidity measurement advice and consultancy; in-depth measurement studies; and design and construction of humidity generators.

Find out more about NPL's Humidity research

Customer Service tel: +44 20 8943 8681

E-mail: humidity_enquiries@npl.co.uk