Fischer 123TMS Home Hygrometer and Thermometer

This is a precision product from the renowned German company Fischer, which has been manufacturing barometers, hygrometers, and thermometers for many years.
This small item combines the functions of a hygrometer and a thermometer, allowing us to monitor the level of air humidity and the temperature in the apartment.
People feel comfortable at temperatures between 18 and 22 degrees Celsius and at air humidity of 35–65%. We should maintain the appropriate temperature and air humidity at home, as they affect our health and well-being.

Basic information:
• Dimensions: 87 x 84 mm
• Brand: Fischer, Germany
• Material: aluminum, brass
• Brass casing
• Hook for wall mounting

Humidity sensor – synthetic fiber, which, unlike the use of hair, guarantees excellent measurement accuracy without the need for servicing the device.

Measurement accuracy:
• Hygrometer measurement accuracy: ± 5% r.h. (20 ... 100%), + 1 scale division
• Thermometer measurement accuracy: ± 1 K, + 1 scale division
Please note that the air humidity measured by a hygrometer located indoors will correspond only to indoor humidity. Outdoors, large fluctuations in humidity occur during the day.
It is important that the device operates in a suitable location, not too close to a heat source and not in a draft. To test its accuracy, the method of wrapping the device in a dry material is used. After about half an hour, the device will indicate the actual humidity with an accuracy of 95–98%.
The appropriate comparison device for it is the ASSMANN ASPIRATION PSYCHOMETER.
It is worth mentioning that Fischer hygrometers are highly regarded by, among others, archives and libraries, i.e. institutions where the conditions for storing documents or book collections are very strict.