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Standard instruments

Standard thermometer

Platinum resistance thermometer sensor and alternating current bridge
Platinum resistance thermometer sensor and alternating current bridge
This instrument features a maximum measurement uncertainty of 0.1 K as operationally required by WMO* for thermometers.

Standard hygrometer

Dew point meter (electronic cooling type) and platinum resistance thermometer
Dew point meter (electronic cooling type) and platinum resistance thermometer
This instrument features a maximum uncertainty of 0.1 K as required by WMO* for standard hygrometers
(from -15 °C to 40 °C). It is used to calibrate hygrometers together with a platinum resistance thermometer.


Standard barometer

Air piston gauge-type barometer
Air piston gauge-type barometer
This instrument features a maximum uncertainty of ±0.05hPa as required by WMO* for standard barometers.



*See the WMO Guide to Meteorological Instruments and Methods of Observation (WMO-No.8).