Henan Wheat Import And Export Co., Ltd. is an import and export company located in Zhengzhou, Henan Province, in the Middle of China. Our main business scope is testing and measuring instruments. Our manufacturer, Henan Hi-Tech Instruments Co., Ltd., is a professional manufacturer of various industry instruments and meters. Our main products include hand held refractometers, digital refractometers, thermometers, PH meters, conductivity meters, TDS meters, electrodes, tachometers, thickness ...