Percival Scientific engineers environmental growth chambers for the superior control of temperature, humidity and lighting fo ... r universities, colleges, government institutions and businesses both domestically and internationally. We have grown to represent a rich tradition of product ingenuity and reliability throughout the world. Our facility encompasses all engineering, design, fabrication and construction of our biological incubators and other product lines, allowing Percival Scientific to maintain complete control of the manufacturing process. This dedication ensures customers the highest quality product upon which they have come to depend. Originally established in 1886, C.L. Percival and J.E. Smith, Percival Manufacturing based in Des Moines, Iowa, initially manufactured and sold butcher tools, machinery and fixtures. By 1901, they had perfected the design for a refrigerated cabinet; prompting Percival to pursue and receive a patent. In the early 1950’s, Percival became involved in creating the first commercially available plant growth chamber. This began the company’s tradition of designing and manufacturing chambers that control the environment for specific research applications. With a history that spans more than a century, Percival will continue its commitment to improving research methods that will impact tomorrow. read more