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About Us

PMS Instrument Company

Learn about PMS Instrument Company, a manufacturer of pressure chamber instruments used to measure plant water potential for agriculture and scientific research.
The Original "Scholander" Pressure Chamber

We provide premium instruments at the best value for our customers

PMS Instrument Company is the original equipment manufacturer of the “Scholander” Pressure Chamber better known as the “Pressure Bomb.” Located in Albany, Oregon, USA, we began building and selling Pressure Chamber Instruments in 1967. Learn more about our products, our history and the scientists and researchers who made this technology possible.
watching petiole for water

Read the biography of Henry Dixon and learn about his contributions to the development of pressure chamber methods for measuring plant water potential.

Explore the biography of John Joly and his role in the early development of pressure chamber science and plant water potential measurement.

Discover the biography of Per Scholander and his contributions to pressure chamber research and the measurement of plant water potential.

Learn about the history of PMS Instrument Company and Joe Zaerr’s role in the development and manufacturing of pressure chamber instruments in his own words.

Explore John Sperry’s account of the history of the double-ended pressure chamber, specifically as it relates to inducing cavitation and measuring vulnerability curves.

Explore the history of PMS Instrument Company and its role in the manufacturing and advancement of pressure chamber instruments for plant research.