Is the laser of PM2.5 detector better or infrared? What is the principle of measurement?

At present, there are two main types of home use:

Laser PM2.5 detector,

And infrared PM2.5 detector;

Because of the characteristics of laser, 0.5 micron can be measured, and some can already measure particles of 0.3 micron. The detection principle of counting is adopted, and the detection accuracy is high. Infrared ray basically depends on photometric principle, and can measure particles with the size of about 1 micron.

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Laser PM2.5 detector is a good quality detector for household use at present, and it is also the general direction of development.

The price of the laser PM2.5 detector ranges from 500 yuan to thousands or even tens of thousands, and the domestic one generally ranges from 500 yuan to 1 10,000 yuan, depending on the quality of course. Generally speaking, the data of laser PM2.5 detector is more reliable.