Features1. Real-time dynamic measurement of PM2.5/PM10 concentration in air. 2. Ambient temperature and humidity measurement/temperature unit conversion. 3. It has three different display mode switching. 4. Many function, MAX/MIN display, data saving function, sound and light alarm settings and LCD backlight display.Specification1. Gas Tested: Particulate Concentration of PM2.5/PM10 in the air 2. Temperature Range: (0-5000)ug/m3; Measuring Range: 1ug/m3; 3. Resolution: 1ug/m 4. Resolution particle size: Greater than or equal 0.3um 5. Response Time: Less than or equal 10S 6. Measuring Principe: Laser diffusion Principle 7. Sensor Type: Universal digital particle concentration sensor 8. Operating Environment: 0-50 degree C, 32-122 degree F; 10-90%RH 9. Power: 3 x 1.2V Ni-MH AAA batteries(Built-in) / 5V / 1A power adapterSpecification: Package Weight One Package Weight 0.41kgs / 0.89lb One Package Size 20cm * 13cm * 8cm / 7.87inch * 5.12inch * 3.15inch Qty per Carton 20 Carton Weight 8.50kgs / 18.74lb Carton Size 42cm * 27cm * 42cm / 16.54inch * 10.63inch * 16.54inch Loading Container 20GP: 559 cartons * 20 pcs = 11180 pcs 40HQ: 1299 cartons * 20 pcs = 25980 pcs