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德國WALZ
創(chuàng)立于1970年代的德國WALZ公司是一家生產(chǎn)與光合作用有關的植物生理生態(tài)儀器的著名公司。公司早期主要生產(chǎn)氣體交換產(chǎn)品（光合儀），在光合作用研究領域占有重要地位。1983年，WALZ公司首席科學家、德國烏茲堡大學的Ulrich Schreiber教授設計發(fā)明了全世界第一臺調制式（PAM）熒光儀PAM-101/102/103，并迅速得到全球植物生理、生態(tài)領域科研人員的青睞，短時間內(nèi)利用PAM發(fā)表的文章數(shù)量激增，并且一直持續(xù)至今。
WALZ公司一直致力于植物生理、生態(tài)儀器的研究，為適合不同的植物材料和研究領域，
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.
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