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Observator 100 years

IAQ-Calc Meters (7515, 7525 and 7545)

TSI’s IAQ-CalcTM Meters – models 7515, 7525 and 7545 – are outstanding instruments for investigating and monitoring indoor air quality (IAQ).

Additional documents


  • Model 7515 is a cost-effective meter for carbon dioxide (CO2) measurements
  • Model 7525 measures CO2, temperature, humidity and calculates dew point, wet bulb temperature and % outside air
  • Model 7545 adds carbon monoxide (CO)
  • Models 7525 and 7545 simultaneously measure and data log multiple parameters


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