[Accurate measurement] - The principle of scattering can achieve accurate measurement and reduce errors.[Control System] - Constant wind pressure and flow adaptive control system.[Stable performance]-The optical system uses high-performance modules and photosensitive components to make the operation stable.[Optimization compensation] - The depth algorithm is used to optimize the compensation to stable and measurement results in different environments.[Excellent design] - The same side inlet simplifies the structural design and dust-proof sensor structural design.size:about 50x38x20mm Material:metalcolour:BluePackage Contents:1 x PM2.5 SensorOnly 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.