马拉松是美国原装进口传感器，旗下两个收购品牌直径22/25mm都有，可供选择机会多，马拉松具有独特的电极结构，电极设计确保了探头的稳定性跟耐用性，保护管采用了RA330合金保护管，这种材料具有红硬性和耐腐蚀性，能够在高温下保持稳定使用。The benefit goes down south to govern six areas, one County class City, the total area is 8227 square kilometers, population 5,960,000, among them downtwn population 2,600,000.Helping the south is one of the city of"national city comprehensive real strenght 50 strong" and"whole country invest hard environment 40 excellent.