TSI's 7545 IAQ-CALC Meter is an outstanding instrument for investigating and monitoring indoor air quality (IAQ). The 7545 model simultaneously measures and data logs multiple parameters. Measurements are CO, CO2, temperature, humidity; and calculations are dew point, wet bulb temperature, and % outside air. The proprietary TSI LogDat2 software permits easy transfer of data to a computer. Data can be reviewed on-screen, or downloaded to a computer for easy report generation. Statistics function displays average, maximum and minimum values, and the number of recorded samples. The 7545 is ideal for verifying building HVAC system performance, examining building IAQ conditions to optimize worker productivity and complying with regulations and guidelines.