Ammonia nitrogen ananlyzer is one of wate quality anlysing meter.
Ammonia nitrogen ananlyzer is to measure the concentration of ammonia nitrogen in various samples.
It is commonly used in environmental monitoring, wastewater treatment plants, agricultural research, and industrial processes.
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Tianan Digital City, Huangge Road, Longgang Central City, I saw the LED billboard on the outer wall of the Digital City. Because the digital city is facing Qinglin Road, this vertical shape advertisement covers the entire office building. Half of the exterior wall, the white light of these billboards with LED light source is particularly dazzling.
Ms. Chen, a nearby resident, said that she had almost made herself a car accident because of this LED billboard. As early as the end of last year, she drove from Qinglin Road to the west. When I got to this position, the advertisement on this display was very bright. I watched it curiously for a while, and suddenly I heard the following vehicles urging the speakers. He rushed to the accelerator and almost hit the front of the vehicle. "The light pollution of the LEDs makes the driver's sight easy to be attracted, resulting in a rear-end collision."
At the intersection of Longgang Avenue and Longcheng South Road, the Longyear Square under construction is in full swing, and it is close to Metro Line 3. The exterior wall of the building is covered with golden advertising slogans. Once in the evening, these dense slogans have become luminous characters. Under the stimulation of the lights, the squares are really eye-catching.
Resident Mr. Wang said that the giant LED advertising screens in these two places are facing some communities, and many residents’ windows are also under the cover of such lights, especially the light emitted at night, which is a serious impact on residents’ rest. And it also poses a certain threat to the traffic safety of passing vehicles.
It is understood that, in accordance with relevant regulations, the approval authority for LED advertisements under 10 square meters in Longgang jurisdiction is in the district urban management bureau, and the city management bureau is more than 10 square meters. Due to insufficient enforcement of relevant departments, the situation of illegal advertisements being cleaned up has occurred from time to time.
In this regard, the person in charge of the Longgang District Urban Management Law Enforcement Monitoring Team said that in recent years, there have been a large number of businesses in Longgang District, such as shop windows, shop exterior walls, and banners, slogans and LED advertisements on the roof and windows. The approval of the department, while some are privately hanged by the business. The urban management department will verify the public's demands as soon as possible, and investigate these giant advertising slogans and LED billboards hanging on the outer wall. If these advertisements are not approved, the district urban management law enforcement monitoring team will urge the street law enforcement team to investigate and deal with them. 
The external wall advertisement of Tianan Digital City in Longgang Central City and the huge advertising slogan of the exterior wall of Longgang Street in Longgang Street not only affect the city appearance, but also the phenomenon of LED light pollution. The public hopes that the relevant departments can increase supervision and strengthen the supervision of outdoor banners, slogans and LED advertisements.