德国WALZ
创立于1970年代的德国WALZ公司是一家生产与光合作用有关的植物生理生态仪器的著名公司。公司早期主要生产气体交换产品（光合仪），在光合作用研究领域占有重要地位。1983年，WALZ公司首席科学家、德国乌兹堡大学的Ulrich Schreiber教授设计发明了全世界第一台调制式（PAM）荧光仪PAM-101/102/103，并迅速得到全球植物生理、生态领域科研人员的青睐，短时间内利用PAM发表的文章数量激增，并且一直持续至今。
WALZ公司一直致力于植物生理、生态仪器的研究，为适合不同的植物材料和研究领域，
Innovation and tradition: These are the driving forces which made the Heinz Walz GmbH one of the world’s top producers of highly sophisticated photosynthesis measuring systems.

Close connections to leading scientists in basic and applied research have stimulated many innovative developments. Excellence in product quality and service have been a tradition of this company since its founding in 1972.

The current product line ranges from the well known PAM-Chlorophyll Fluorometers to measuring systems of plant gas-exchange for physiological and ecophysiological research. Dew-Point Mirror Measuring Systems as well as Cold Traps and Measuring Gas Coolers complement the line of products.

A network of distributors in many countries provides close contact and technical advice to customers throughout the world.