Zhu zhengdan, a legal person, is a one-stop service provider of professional instrumentation. Main battalion: hale medical \\/slightly cryogenic equipment, biosafety cabinets, clean workstations, centrifuges, incubators, fungicides, hot and wet tanks, liquid nitrogen cans, river fluid pumps, freeze dryers, bottling machines, electrostatic scales, hydrometers, thermometers and associated laboratory instruments and provision of marketing and maintenance services (sale of non-hazardous chemicals)