Pm2.5 detector laser AIRNOW air quality monitor household dust haze table DESCRIPTION Features: No calibration without preheating start that is measured Traditional, English, Simplified; GB, American Standard; brightness arbitrarily set (Connect the computer real-time push data, support firmware upgrade) about me I am a technical house, is also a DIY enthusiastic fans. Fortunately, they do not have to run around with their own lives, a healthy family, there are spend love. Part-time shop is the heavy work of the fun, I hope their elaborate baby to get more recognition, more harvest a sense of accomplishment. Perfectionism I will carefully do every piece of baby. I hope to bring you all kinds of beautiful baby to come here. About haze: (Haze weather since ancient times), but very few people know that this stuff is called haze (horizontal visibility is less than 10 km, the humidity is less than the temperature of less than 10 km, the humidity is less than 10 km, the humidity is less than 10 km, 80% is called haze, 80% to 90% is called haze, more than 90% is fog). In 2011, the Ministry of Environmental Protection began to implement the "ambient air PM10 and PM2.5 determination of weight method" before the "blue sky" number has been used to evaluate the city's air quality. For more information please refer to the chain "PM2.5 popular science" Talk Monitor: At present the national environmental protection departments widely used PM2.5 determination of three methods: gravimetric method, β-ray absorption method and trace oscillation balance method. The accuracy of the relationship between the three: gravimetric method> micro oscillation balance method> β-ray absorption method. As the above way there are high input costs, high maintenance costs, large size and other issues can not be carried out on-site monitoring of air quality can only be used in the government's air quality monitoring stations or professional experiments, can not be used for ordinary people. In addition to the above three professional methods, there is a scattering principle by the school, is a low-cost measurement method, with the measurement speed, real-time good features. Whether it is the monitor, for the average person, the main significance is to understand the cleanliness of the environment, to understand the effectiveness of purification means, the specific numerical on not too seriously, and we are not engaged in scientific research (I monitor the terminal laboratory Where done dozens of professional equipment, data comparison, the same consistency of less than 100%). Talk about my DIY: The end of 2012 began to pondering the DIY monitor, the benefits of Beijing is very easy to experience a variety of pollution levels of weather, after nearly three years of repeated testing and tuning (several times with several hundred thousand dollars of professional equipment to do comparative analysis), accuracy, Stability has been very good. During the period as a friend, colleagues do a lot of free Taiwan. At that time saw Chai Jing documentary "under the dome", admire her at the same time, what should be done, and now plenty of spare time, decided to open a shop, so that more people share my results, more people understand themselves The degree of pollution of the environment. Also hope that more people concerned about environmental protection. Low-carbon life, starting from the bit by bit, from the side to start. DIY era brought unprecedented benefits, because we will be a high-end detector to take out the core components. No gorgeous shell, no commercial publicity, only a more affordable, more professional, more by general air detector! Package Contents : 1 x Pm2.5 detector laser AIRNOW air quality monitor household dust haze table PAYMENT We Only Accept Paypal on Ebay. For specific requirements, please feel free to contact us. SHIPPING Shipping: Packages are sent from overseas, please expect lengthy custom delays if you choose to use default shipping service. Shipping to some countries is slow. That depends on your local postal service. Most orders to USA take about 7-20 days using epacket(USPS first-class service with tracking#). Shipping to most other countries takes about 10-30 days via Economy Int'l Airmail without tracking#. In rare case, it can take up to 40 days. It depends on your location and local postal service(e.g., Russian Postal service is slow), as well as the weather condition along the shipping. We don't take responsibility if you submit wrong address. Here's an approx delivery time to some countries: Please contact us if you need a tracking# or express shipping service. TERMS OF SALE If you are facing with troubles below, please contact us as soon as you can Defective or Wrong: full refund or send you a new replacement Missing: new package arranged, or partial refund Dislike: full refund after we received your item (buyer undertakes return shipping fee) ABOUT US Our working time is 08:30-17:30 from Monday to Friday in Beijing Time. Because of the time difference, we may not reply your email immediately. All emails will be replied in 24 hours, please understand that. We devote to making the best service for you. We look forward to serving you. Any questions, please contact us via our ebay email. Your emails are warmly welcomed. CONTACT US Consumers' satisfaction is our first priority and pursuit . We promise to solve your problem in a good way . We consider neutral and negative feedbacks as a SHAME. So please never give us a neutral or negative feedback before communicating with us . On Nov-09-16 at 23:48:10 PST, seller added the following information:
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