Which brand and specification of peak flow meter (for monitoring respiration) is better?

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1. Introduction to Wulingyuan National Scenic Spot (English)

Wuling source scenery scenic spot position northeast Hunan Province.The scenery scenic spot area scope is the east longitude 110 ° 20 "30"~110 ° 41 "15" North latitude 29 ° 16 "25"~29 ° 24 "25" Total area 390.8 square kilometers, among, peripheral safety trip area 126.8 square kilometers. Is situated at the central Asia tropical climate region, which is Yamahara thehumid climate. In the area the quartz sand rock pillar peak has 3,103,the kilometer take Shangfeng column 243, the high point as the rabbitfull moon peak, the elevation 1264.5 meters; Boundary minister of theinterior 2,000 meter above run-off ditch 32, the total length amountsto 84.6 kilometers, among, is most famous by Jin Bianxi. The peak isthree cliffs canyons place at most, often lives in contentment for themountain person sets up camp place, most famous has the Huang Shihstronghold, the hawk nest stronghold, the percussion instrumentstronghold, hides the official stronghold and so on. The Wuling source is the biological treasure house, in the area theplant vertical climatic zone spectrum obvious, the group falls thestructure integrity, the ecosystem is balanced, is the Chinese - Japan Flora Central China plant area, is this plant area core region,is containing the multitudinous ancient precious plant and the Chinaunique plant resources. Forest coverage rate reaches 88%. The higher planthas 3,000 kinds, xylophyte has the l07 branch, 250 is, 700 kinds.First batch includes "China Rarely and preciously Is in imminentdanger Protection Plant Name list" the key protection plant to have 35kinds. The land fresh vertebrate has 50 branches, 116 kinds, is thecountry grade one protected animal

3 kind, the national two levels ofprotections animals 10 kind, the national three levels of protectionsanimals 17 kinds. In 1988 the State Council examined and approved the Wuling source forthe national key scenery scenic spot area, and the authorizedestablishment province governed Zhangjiajie the city, established theWuling source area people"s government, strengthened the sceneryscenic spot area the protection and the management. In December, 1992,the Wuling source is officially included by the United NationsEducational, Scientific and Cultural Organization as the naturalheritage "World Inheritance Name list ". Natural heritage Has the prominent value the geological landform The Wuling source in the areal structure system, is in the newChina third upheaval zone. In the long geologic history time, hasapproximately experienced a Wuling snowy peak, Indo-China, Mt.yanshan, happy Shan Jixin the tectonic movement. The Wuling - snowypeak movement has established the home court basal structure. TheIndo-Chinese movement has molded the home court fundamentalconstruction landform rack, but happy Shan Jixin the tectonic movementforms one of Wuling source unusual silicarenite peak forest landformlandscape most basic intrinsic factors. The constitution sandstone peak forest landform stratum mainly by thefar paleozoic group in, the Upper Devonian Yuntai View Group and the Huang Family Pillar Group Constitutions, Strategy Demonstration Coastal Phase clastic rock class characteristic. Crag lithical pure, level thick,the bottom shape is gentle, the vertical festival principle growth,the rock appears to the syncline outline, reflected the sandstone peakforest landform landscape forms special geologic structure environmentand basic co

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