2.8inch TFT screen, colorization display, wide angle vision up to 180° Acrylic clear case shell, high transmittance to be looked through Working Principle: Multi-angle Laser Scattering Detection, laser irradiation in the suspended particulate matter in the air and generate scattering. Scattered light be collected in a specified angle at the same time. According to the scattering intensity, time-varying curves can be obtained through the sensor. Being processed by the microcomputer processor, equivalent particle diameters and the number of suspended particulate matter with different sizes in per unit volume can be obtained. Built in for ARM 32 bit processor, accurate detection & system fluency High sensitivity sensor ensures the high accuracy in data collections, Manufacturer: Akfldms