TOPTION is professional lab solution provider,and all devoted to provide the best solutions & products for global customers, who are work in biology, chemistry, pharmaceutical, environment analysis, food, academic research, etc. Regardless of the field you work in, we keep striving for the same goal: to provide you with the most suitable solutions & products, to make your research more accurate & efficient. TOPTION headquarters is located in Xi'an, China, where own hundreds of universities and research institutes, and famous as its thousands of years long history culture. Profound culture and strong scientific research strength, provide sustained and vigorous power for TOPTION development, so that make us could provide better products,solutions and service for you continuously. Main products contains chemical synthesis reactor, rotary evaporator, thin-film evaporator, photochemical reactor, high pressure reactor, freeze dryer, spray dryer, etc. TOPTION brand instrument has ow