Thermohygrometer BZ15M

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BZ15M thermohygrometer

For quickly controlling your healthy indoor climate

The indoor climate hygrometer BZ15M is easy to read and understand, it indicates the ideal climate values in interior spaces depending on room temperature and season. The special scale design with colour gradient from bright to dark yellow serves to indicate both room temperature and relative humidity. 

Moreover, the thermohygrometer is fitted with a convenient season-based ventilation recommendation – which, if consequently observed, can help prevent the harmful mould formation and growth in interior spaces. This makes the hygrometer BZ15M an ideal tool for the quick and simple climate control in living spaces including living or bedrooms, offices, training or assembly rooms.

The thermohygrometer BZ15M is equipped with a high-quality mechanical measurement technology "made in Germany" that guarantees a high measurement accuracy of ± 3 % RH in the range from 20 to 100 % RH without the need for maintenance. This mechanism is employed to measure the change in length of a specially pre-treated synthetic fibre that expands in humid conditions and contracts when it is dry. The length variation is converted into a rotary motion using levers and axes and communicated by the needle. The display of the hygrometer can easily be calibrated and amended by way of a zero correction.

How to assign climate values correctly

Read the room temperature from the thermohygrometer and match it with the corresponding colour ranges:

  • dark yellow for little heating 16-18 °C
  • medium-range yellow for normal heating 18-22 °C
  • bright yellow for intensive heating 22-24 °C

On the scale for the atmospheric conditions outside you can identify: 

  • winter by average temperatures below +5 °C 
  • autumn/spring by average values between 5 and 15 °C

A few practical benefits:

  • High-quality mechanical measurement technology "made in Germany"
  • Special scale design with season-dependent ventilation recommendation for optimum climate values
  • Simple readability and interpretation
  • Incl. calibration option

Now you can recognize the ideal target humidity range for your living space by the colour that matches the room temperature.

Example for correct reading

At a room temperature of 20 °C during the winter a relative humidity level of 40-50 % should not be exceeded. If so, reduce the humidity through ventilation. The depiction of an open window on the dial of the thermohygrometer BZ15M indicates the necessity for intermittent full ventilation. The most effective ventilation period for the respective season is given in minutes. 

Application examples from practical experience:

BZ15M – application for pianos
BZ15M – used in the living room
BZ15M – used at the office


BZ15M Thermohygrometer show in Trotec online shop

BZ15M Thermohygrometer

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54.94 € 49.95 € incl. VAT Show net price (VAT not included)


Technical data

Technical data
General information
  Article number 3.510.205.012
Air temperature [°C]
  Min. measuring range | Air temperature [°C] 0
  Max. measuring range | Air temperature [°C] 40
  Resolution [°C] 2
  Accuracy ± | Air temperature [°C] 2
  Accuracy [°C] 2
Relative humidity (%)
  Min. measuring range | Relative humidity [%] 0
  Max. measuring range | Relative humidity [%] 100
  Resolution | Relative humidity [%] 1
  Accuracy ± [% r.F.] 3
  Accuracy 20 % - 100 % [%] 3
Housing design
  Stainless steel
Ambient conditions
  Operation - min. temperature [°C] -10
  Operation - max. temperature [°C] 50
  Operation approx. - max. relative humidity (non-condensing) [%] 100
  Storage - min. temperature [°C] -10
  Storage - max. temperature [°C] 50
  Storage - max. relative humidity (non-condensing) [%] 100
Standard scope of delivery
Standard scope of delivery
  Operating manual
Ascertainable measured values and functions
Functions and features
  Measurement of air temperature and relative humidity

 standard equipment

 optionally available

 not available

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