TSI's IAQ-CALC™ Indoor Air Quality Meters 7525 are outstanding instruments for investigating and monitoring indoor air quality (IAQ). Model 7525 simultaneously measures and data logs multiple parameters such as CO2, temperature, humidity, and calculates dew point, wet bulb temperature, and % outside air.


  • Low-drift NDIR CO2 sensor for stable, accurate readings
  • Sampling function records multiple point measurements
  • Ergonomic, overmolded case design
  • Temperature and relative humidity measurements help determine thermal comfort
  • Calculates % outside air from either CO2 or temperature
  • Directly calculates dew point and wet bulb temperatures
  • Model 7525 shows up to three parameters


  • Verify building HVAC system performance
  • Examine building IAQ conditions to optimize worker productivity
  • Comply with regulations and guidelines


  • Instrument
  • Hard carrying-case
  • (4) AA alkaline batteries
  • Operation and service manual
  • NIST calibration certificate
  • Logdat2 downloading software with USB cable
  • AC adaptor