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  1. Products & Services
  2. Measuring devices
  3. Climate
  4. Climate measuring instruments
  5. BC21 Thermohygrometer

BC21 Thermohygrometer

Accurate, pocket-sized climate measuring device

High-quality sensor technology and numerous measuring functions make the BC21 the ideal climate measuring device for workshop, hobby and household applications:

The relation of humidity and temperature is decisive for ideal climate conditions in living, work or storage spaces. Prevailing feel-good climate? Risk of mould growth or rust?

Due to the integrated dew point temperature measurement, all issues evolving around the building climate control can quickly and easily be investigated using the BC21.

With its impact-proof and rigid stainless steel probe the robust construction cuts a remarkably fine figure even in the rough everyday usage of ventilation and air-conditioning technicians – the additional function for measuring the wet-bulb temperature also enables a universal application of the BC21 in planning, measuring and performance control of air-conditioning and ventilation systems.

A few practical benefits:

  • Development, design, production: 100 % Trotec
  • Measurement of diverse climate data with only one device: relative humidity, air temperature, dew point and wet-bulb temperature
  • Optimum price-performance-ratio
  • Dual display for parallel presentation of measured values
  • Maximum or minimum value and hold function
  • Rapid response time
  • Soft-touch function keys
  • Easy, one-hand operation
  • Backlit display
  • Automatic switch-off
  • Robust construction
  • Practice-optimized German industrial design - protected design patent


Thermohygrometer BC21 im Trotec Webshop zeigen

Thermohygrometer BC21

Eine hochwertige Sensorik und zahlreiche Messfunktionen machen das BC21 zum idealen Klimamessgerät für Haushalt, Hobby oder Werkstatt. Es ermöglicht die Messung vielfältiger Klimadaten mit nur einem Gerät, wie zum Beispiel die relative Luftfeuchte oder die Lufttemperatur.

Sie sparen: 35 %

76.95 € 49.94 € inkl. MwSt. Nettopreis exkl. MwSt. anzeigen

jetzt kaufen

Technical data

Technical data
General information
  Article number 3.510.205.006
Air temperature [°C]
  Min. measuring range [°C] -30
  Max. measuring range [°C] 100
  Resolution [°C] 0.01
  Accuracy ± [°C] 1
Air temperature [°F]
  Min. measuring range [°F] -22
  Max. measuring range [°F] 199
  Resolution [°F] 0.01
  Accuracy ± [°F] 1.5
Relative humidity (%)
  Min. measuring range [%] 0
  Max. measuring range [%] 100
  Min. measuring range | Specified [%] 5
  Max. measuring range | Specified [%] 95
  Resolution [%] 0.01
  Accuracy 25 °C - 5 % - 95 % [%] 2
Dew point temperature [°C]
  Min. measuring range [°C] -30
  Max. measuring range [°C] 100
  Resolution [°C] 0.01
  Accuracy ± [°C] 1
Dew point temperature [°F]
  Min. measuring range [°F] -22
  Max. measuring range [°F] 199
  Resolution [°F] 0.01
  Accuracy ± [°F] 1.5
Wet-bulb temperature [°C]
  Min. measuring range [°C] 0
  Max. measuring range [°C] 80
  Resolution [°C] 0.01
  Accuracy ± [°C] 1
Wet-bulb temperature [°F]
  Min. measuring range [°F] 32
  Max. measuring range [°F] 176
  Resolution [°F] 0.01
  Accuracy ± [°F] 1.5
Device control
  Push buttons
Housing design
Power supply
  External (power adapter)
  Internal (battery) 1 x 9 V battery
Ambient conditions
  Operation - min. temperature [°C] 0
  Operation - max. temperature [°C] 40
  Operation approx. - max. relative humidity (non-condensing) [%] 80
  Storage - min. temperature [°C] -10
  Storage - max. temperature [°C] 60
  Storage - max. relative humidity (non-condensing) [%] 80
  Length (packaging excluded) [mm] 225
  Width (packaging excluded) [mm] 32
  Height (packaging excluded) [mm] 54
  (packaging excluded) [kg] 0.2
Standard scope of delivery
Standard scope of delivery
  Measuring device
  Operating manual
  Storage case
  Factory test certificate
Ascertainable measured values and functions
Internal sensors
  Relative humidity [%]
  Air temperature [°C]
  Air temperature [°F]
  Dew point temperature [°C]
  Dew point temperature [°F]
  Wet-bulb temperature [°C]
  Wet-bulb temperature [°F]
Functions and features
  Minimum value display
  Maximum value display
  Measured value hold function
  Switching function °C/°F
  Automatic switch-off
  Backlit display

 standard equipment

 optionally available

 not available



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