Henan Hi-Tech Instruments Co., Ltd located in Henan Province, Middle of China, are professional manufacturer and exporter for various industry instruments and meters. Our main product include Hand Held Refractometer, digital refractometer, thermometer, pH meter, conductive meter, TDS meter, electrode, Tachometer, thickness meter, sound level meter, humidity meter, moisture meter, Lux meter, spectrophotometer, and Surveying Instruments etc.