Accurate data: laser-detection, stable and consistent Fast response: data update frequency 1Hz Easy to integrate: serial port output (or IO port output), with a fan High resolution: the smallest diameter of the resolved particles is up to 0.3 Micrometre Scope of application: PM2.5 detector, purifier. working principle The principle of laser-scattering is adopted: when the laser-beam is irradiated to the particles passing the detection position, weak light scattering will be generated. The light scattering waveform in a specific direction is related to the particle diameter. Different particles can be obtained through the waveform classification statistics and conversion formulas of different particle diameters. According to the calibration , concentration of the real-time particulate matter is obtained in accordance with the official unit. Colour: as shown Material: ABS Size: 71 x 70 x 23mm Package Contents: 1 x PM sensor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.