325 Hygrograph

The Fischer Mechanical Hygrograph chart recorder can track humidity trends in real time.

The instrument is constructed of brass and finished in matt chromium plate. All axles are fitted with jewel bearings meaning the instrument has considerably low friction. The 325 Hygrograph uses the change of human hair or synthetic fibres depending on the moisture contained in the air to measure humidity. Fischer’s specialist treatment of the hair is the reason for the very low response time, even in the case of very low temperatures. For this reason, Fischer hair hygrographs are the preferred instrument for outdoor measurements.