No. 77h Hair-Hygrograph
The Hygrograph records relative humidity of the atmosphere on a 80 mm width recording chart. This important climatic factor plays a decisive role in the meteorological and climatological investigation.
It has a laquered stainless steel housing and glas windows and an outside arranged measuring element. The measuring instrument is characterized by high accuracy and durability for longllife operation . The high precision model uses a special preparated hair harp made by 5 bundels of 26 human hairs.
The Measuring accuracy of the hair harp corresponds to highest requirements. The limits of error in the measurement of humidity amount to ±2.5 % of the extent of the measuring range.
Equipped is the instrument with a high quality mechanical spring driven movement in coloured brass drum.
Measuring range: 0...100% relative humidity
Time of drum rotation: daily or weekly
Recording drum: Ø 93.3 mm Height: 93 mm height of recording: 80 mm time of running: app. 9 days
Accessories: 1 fiber pen 1 wetting cloth 1 set of recording charts (100 charts for daily or weekly rotation)
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