Hygrometer with synthetic fibers

The figure shows the hair hygrometer in the first brochure from Feingerätebau Kurt Fischer in Drebach. A relic of ancient times? More than 50 years later, the FISCHER Classic winner at Stiftung Warentest issue 3/2003!

The only tested the hygrometer FISCHER instrument reached the rating VERY GOOD (1.3) in the HUMIDITY MEASUREMENT. Judges here have measurement accuracy, hysteresis and response speed. Also with regard to the HANDLING received the hair hygrometer with GOOD (1.7) the best rating.

Hygrometer used to measure the relative humidity and is based on the hygroscopic properties of natural hair or synthetic fibers, which change their length with change in humidity.

While natural hair can also be used at temperatures below 0 ° C, react hygrometer with synthetic fibers in this temperature range extremely sluggish and are therefore not recommended for outdoor use.

Hair hygrometer require regular regeneration (time interval: a few weeks), with hygrometers with synthetic fibers, this is generally not necessary.

The main features of the hygrometer with natural hair are:

• Can be used below 0 ° C
• when sufficient natural variation of RELT. Humidity there is a self-regeneration of natural hair
• low hysteresis (1.3)
• high rate of reaction
• Good Handling (1.7)
• high reliability
• easy handling