The wind and haze covered the capital for several days. The emperor was afraid of the wrath of the gods, so he sent the Ministry of Rites to burn incense to the sky and pray for the gods to dispel the wind and haze.

——History of the Yuan Dynasty

Haze is not a modern phenomenon. According to the records in the History of the Yuan Dynasty, in the sixth year of the Zhiyuan era, the haze covered the sky for several days. The emperor worried that it was the wrath of the gods, and ordered the Ministry of Rites to burn incense to the sky, praying that the gods would dispel the haze. In modern times, the three industrial revolutions aggravated the incidence of haze, especially the London haze event in the 1950s, which directly led to the death of more than 8000 people due to respiratory diseases.

In the past two years, PM2.5 has come into people's view, and a new weather element: haze has also been added to the weather forecast of the central meteorological day. Each city has also increased the monitoring and website publishing for PM2.5. With the development of the Internet of Things, handheld PM2.5 detectors also came into being. What we bring you today is a PM2.5 detector based on the laser scattering principle. The detection accuracy can reach ± 10%. What is its detection effect? Let's have a look

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A brief talk before the article

I believe that you will be curious about 352 when you see this 352 PM2.5 detector. Here, I would like to talk to you. The 352 PM2.5 detector is developed and produced by Beijing 352 Environmental Protection Technology Co., Ltd., and the 352 is named after "three under five to remove two". The designer hopes that the developed product can quickly remove haze and purify.

352 - Unpacking

352's packaging is somewhat similar to the current mobile phone packaging, simple and clear. On the front is the plain face photo of the detector. The displayed value is exactly 352, which gives a slight bulge to the touch. On the back are some detailed descriptions of products and company information.

Open the cover and have a look: the host, power cord, user manual, certificate of conformity are all available.

The 352 PM2.5 detector adopts an aluminum alloy shell design, and the integrated molding technology makes it look very, very good.

The 352 PM2.5 detector is very simple to use. In the stand-alone mode, press the switch and wait a moment to see the PM2.5 detection value of the environment.

Of course, if you think that the 352 PM2.5 detector is just such a simple function, you are totally wrong. The 352 PM2.5 detector also has the online detection function... As detailed below, the following figure is some official files about the 352 PM2.5 ↓

352 - Play

Compared with the mobile phone (5.5 inches), the size of the 352 PM2.5 detector can be clearly seen. The weight of the main body is only 240g, which is about the same as that of the mobile phone. The standard 2400mAh large capacity battery is sufficient for daily test use.

Gently press the power on button to hold the environmental quality. It should be noted that in the process of use, remember not to cover the heat dissipation hole on the body, and do not put it on the hand for measurement, because there will inevitably be shaking, it is better to put it in a fixed place for measurement, which will be relatively stable. Vibration environment will seriously cause inaccurate measurement results.

At the same time, when the machine is working, listen carefully, and you can hear a slight sound. Don't worry, it should be the sound of the cooling fan, which can be almost ignored. If you still think about the tester, you can check it in the APP's Faults and After Sales - User Guide.

352 Networking

By scanning the QR code at the bottom of the 352 PM2.5 detector, you can easily download it to the corresponding APP. There are many ways to register APP: mobile phone number QQ、 WeChat and microblog are convenient for you

Knock the table. Now let's begin to focus. When performing networking pairing, you need to turn on the switch of the tester first. When you see the display screen is lit, press the power on button again for more than 3 seconds, and the wireless icon on the display screen appears. At this point, the device can be connected through APP.

This point is described in the manual in a general way. Previously, the wireless networking function of the device could not be enabled. We consulted the official staff to solve this problem. If we change a little, we can easily solve this problem. We hope the official will explain this connection method in more detail in the next version of the manual.

352 - Summary

In general, this 352 PM2.5 detector is very good. It caters to the current society's sensitivity to air quality and allows users to easily know the PM2.5 value of their environment. I believe many environmentally sensitive friends will favor this product.  

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