The OS1-FL is a highly portable and cost effective modulated chlorophyll fluorometer ideal for fast measurements and stress evaluation. Designed for light adapted yield and ETR measurements as well as dark adapted Fv/Fm plant stress measurement. When hundreds or thousands of measurements need to be made in a day, this workhorse is an excellent choice.

• Great for detecting stress causing agents that effect photosystem PSII.
• The OS1-FL provides direct readout of FV/Fm, Fm, and Fo, as well as Yield (or ΔF/Fm’), Fs(or F), Fms (or Fm’) the most used, and most robust stress measurement parameters.
• Both PAR and leaf temperature measurements are possible as well with the Optional OS1-FL Par Clip.
• Flexible fiberoptic probe allows greater measurement flexibility.
• Up to 4,000 measurements can be stored on the OS1-FL and may be transferred with its built in computer interface for spreadsheet analysis, graphing, or storage.