In fact a female affair ...
is the donation of choice natural hair for use as a humidity measuring element. The resulting manually adjusted sensitive natural hair grid has been employed for decades outdoors or when high accuracy is required. The precision mechanics meter drives the recording drum (acc. to DIN 58658), on which the special smear-proof charts are mounted. The even draft of curves as a continuous recording of relative humidity is written by a felt pen.
independant of mains power
very low maintenance
very robust (metal housing)
long-term and stable measuring element
easy reading and handling
large temperature application range
00.02500.131000 (250 Ua): Recording period 7 days or switchable 1 day (31 days on request) - Graph paper: 34.02500.001000 (250 D1) or 34.02500.003000 (250 D3)
(252-144a) Felt-tipped pens (6 pieces) red
(252-144b) Felt-tipped pens (6 pieces) black
The ink of a felt-tipped pen is sufficient for one year. The felt-tipped pens are applicable for all drum recorders.