UNI-T UT938C Pm2.5 Detector Haze Dust VOC Tester Air Quality Meter Sensor with Thermometer Temperature Rh Humidity and Pm2.5 Detector Indicating PM2.5 pollution level and 1-hour average amountand VOC(volatile organic compounds) Large LCD screen with bright backlight, convenient to use An ideal instrument for monitoring indoor air quality Displaying temperature in Celsius(C) or Farenheit(F) Suitable for house, shopping mall, bus station and other places