LKC-1000S+ Functionality: HCHO/PM2.5/PM10/Particles/AQI+Temperature+Humidity+TVOC+Recording CurveLKC-1000S Functionality: HCHO/PM2.5/PM10/Particles/AQI+Temperature+HumidityLKC-1000E Functionality: HCHO/PM2.5/PM10/Particles/AQIP600 Functionality: PM2.5/PM10