1000E	1000S	1000S+	M2000	M2000C
Size(inch)	7 * 2.6 * 1.3	7 * 2.6 * 1.3	7 * 2.6 * 1.3	8.8 * 2.9 * 1.5	8.8 * 2.9 * 1.5
PM2.5&PM10&Particles	✓	✓	✓	✓	✓
HCHO	✓	✓	✓	✓
CO₂				✓	✓
AQI	✓	✓	✓
TVOC			✓
Histogram			✓	✓	✓
T&H		✓	✓	✓	✓
Backstand	✓	✓	✓
Audible Alarm				✓	✓