美国Percival Scientific 
拥有百年历史的PERCIVAL科技公司不断为环境控制工业建立标准，现已生产13个种类，近80个型号的培养箱，覆盖整个动物、植物培养领域和环境测试领域。另外，还可以根据客户的具体实验需求定做培养箱。所有产品从设计到生产每个环节都由PERCIVAL完全掌控，从而确保产品质量。 默克(Merck)、礼来(Eli Lilly)、罗氏(Roche)、法玛西亚普强(Pharmacia & Upjohn)、美国陶氏益农公司(Dow AgroSciences)、美国国家宇航局(NASA)、杜邦(DuPont)、孟山都(Monsanto)、诺华(Novartis)及法国葡萄酒酿造厂等著名跨国企业都是PERCIVAL的客户。在我国，北大、清华、复旦、中科院、农科院、北京生命科学研究所、天药药业、泰德制药等众多知名科研院所和企业也正在使用PERCIVAL的各类产品。
Today, Percival Scientific continues to set the standard of excellence for the environmental control industry and occupies over 60,000 sq. ft. of manufacturing space dedicated to the production of over 50 different models of plant growth chambers, biological incubators and special application chambers. To ensure each unit is of the highest quality and dependability, all Percival chambers are handcrafted in Perry, Iowa. Innovating pursuits of superior control of temperature, humidity and lighting have kept Percival at the forefront of their industry. The company also produces chamber accessories and offers a variety of optional accessories to meet specific customer needs.

Percival Scientific's chambers and incubators have features not offered by any other company and are the preferred choice of universities, colleges, government institutions and private firms in all 50 states and throughout the world. Outside of the university laboratory setting, Percival serves well-known clients, such as: Dow AgroSciences, Pioneer Hi-Bred, Monsanto, Novartis, NASA, Eli Lilly, Merck Pharmaceuticals, Revlon, Mary Kay Cosmetics, Shedd Aquarium, and Campbell's Soup.

Originally established in 1886, by C.L. Percival and J.E. Smith, Percival Manufacturing in Des Moines, Iowa, initially manufactured and sold butcher tools, machinery and fixtures. By 1901, the need for a refrigerated cabinet became evident, prompting Percival to pursue and receive a patent. Forty years later, in 1941, the company moved to a new 24,000 sq. ft. facility and continued to manufacture a complete line of refrigerated display units.

In the early 1950's, at the request of Iowa State University, 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. Additionally, Percival recently partnered with Iowa State University's Department of Engineering to create a highly resourceful incubator control package that is an exclusive product in the industry.

From its beginning on the Central Iowa Plains, Percival Scientific has grown to represent a rich tradition of product ingenuity and reliability throughout the world. With a history that spans more than a century, Percival will continue its commitment to improving research methods that will impact tomorrow.