... have groups people.The instrument working principle is for a laser light shining on the particles, And then by solid scattering ... parametersWorking principle: Light scattering Simultaneous Measurement : PM10, PM2.5Concentration range: 0.1 ~ 10,000 ug/m3Sampling flow velocity: 1.2 l/min(built-in ... : 5% in max. rangePower: 100 ~ 240VAC, 60Hz (12.6 VDC, 1.2 A)Size weight : 180 x 95 x 65 mm ...