Wide range of applications, users no longer need to design the air duct ultra-thin design, only 12 mm, suitable for portable devices. This sensor uses the principle of scattering, that is, is irradiated on suspended particles in the air to produce scattering, and at the same time, the scattered light is collected at a specific angle to obtain the curve of the scattered light with time. Furthermore, the microprocessor uses an algorithm based on the MIE theories to obtain the equivalent particle size of the particles and the number of particles of different sizes per unit volume. Six‑sided omnidirectional shielding, strong anti‑interference performance. 0 error alarm rate, real‑time response and support for continuous acquisition, minimum resolution particle size 0.3um. Adapter board and cable color random, don't accept the specified color. Colour: As shown Material: metal + plastic Package Contents: 4 x PMS7003 sensor 4 x adapter board 4 x line Only the above package content, other products are not included. Note: Light reflection 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.