MULTIFUNCTIONAL & SCIENTIFIC – As our newest model, this indoor air quality monitor accurately assesses temperature in Celsius, humidity level, and multiple measures of air quality including concentrations of formaldehyde, total natural & synthetic volatile organic compounds causing most odors (TVOC PORTABLE TESTING – Spot check indoor air quality anywhere or leave device on for continuous monitoring. This easy-to-carry air quality tester can help monitor air quality at home, in the car, and in hotel rooms. ADVANCED FAN & SENSORS – This air quality monitor has a built-in fan to quickly draw in ambient air to allow REAL-TIME measurements. HEALTHY HOME? – Is your family suffering from sick building syndrome? This air quality tester detects organic compounds like formaldehyde which has suspected links to nasal cancer and lung cancer emitted from many household materials.