Established in 2002, Zhengzhou Hualing Instrument & Apparatus, Co., Ltd., is specialized in various kinds of Bimetal thermometers, Glass thermometers, Vapor actuated dial thermometers and liquid-filled thermometer, Temperature controller, Pressure gauge, Night blind, etc. We have gained the certification of National sanitation Foundation (NSF) ever since our foundation, so our products sell well in China and overseas market such as North America, Europe, southeast Asia etc. The export sales amount accounts for more than 50% of the total reven