Zhengzhou Greatwall Scientific Industrial & Trade Co.,Ltd. is a comprehensive company merging research, development, production and operation into a single whole. Since the establishment in April, 1988,the company has developed teaching instruments and equipment including water circulating type multipurpose vacuum pump, low temperature cooling liquid circulating pump, low temperature cycling pressure pump;low temperature;vacuum pump;digital-control super low temperature constant temperature slot;chemical reaction experiment device;digital display direct-current stepless speed adjustment treater, glass container quick baker, digital display small vacuum dry box, freezing vacuum dry box and electric heater.
