For indoor measurements and in low humidity, synthetic hygrometers are preferable. The specially treated fibers of the Fischer synthetic hygrometer 12201 are insensitive to temperature (temperature range 0 to +70 °C) and respond quickly to changes in humidity.
Measuring range 0 to 100 % relative humidity
Accuracy ± 3% + 1 scale graduation RH
Graduation RH 1 %
Stainless steel case
Diameter: 4 inches (103 mm)
Unit weight: 12oz (340g)