OS30p+ Plant Stress Meter
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OS-30p+ Rapid Plant Stress Screening Device An enhanced, hand-held device for Fv/Fm and OJIP analysis Small hand-held device Integral optical probe Accurate Fv/Fm Advanced OJIP analysis Colour graphic display Large integral data storage Cost effective Using Chlorophyll Fluorescence to analyse plant stress Chlorophyll fluorescence is proven to provide reliable, non-destructive information regarding the photosynthetic processes and plant health/stress. Fluorescence tests can be easily and quickly performed by the pre-darkening of the leaf followed by short exposure to a saturating light intensity. Measuring the fluorescence intensities over time produces a Kautsky induction curve. The shape of this curve and the value of significant transient levels on the curve are used to assess environmental stress damage on the photosynthetic apparatus. Accurate Fv/Fm and OJIP analysis Fv/Fm is the most widely used fluorescence test for plant stress detection. Fv/Fm, defined as Maximum Photochemical Efficiency, is a comparative measurement of plant stress with lower values indicating plant stress. The OS-30p+ is designed for the rapid screening of Fv/Fm. The OJIP test uses higher sampling rates to resolve early fluorescence transient steps in the Kautsky curve. These steps are affected differently by different types of plant stress. The OS-30p+ uses the revered Strasser* equations for all OJIP parameters. The OS-30p+ ensures the most accurate Fv/Fm, Fv/Fo and OJIP results by measuring Fo, rather than offering an estimated value. Single hand operation The battery operated OS-30p+ features a built-in optical probe, meaning that only one hand is required to operate the unit. Lightweight leaf clips are provided for effective pre-darkening of the measurement site prior to the induction of fluorescence. These non-destructive clips are suitable for use on a wide range of plant species. Measurements are made by introducing the analysis probe to the leaf clip. The leaf clip shutter is then withdrawn, exposing the dark adapted site to an auto-calibrating, saturating, excitation 660nm LED source. Induced fluorescence is measured by a PIN photodiode at >700nm. Excitation intensity and experimental duration is user selectable. The OS-30p+ provides a direct read-out of both the standard and an enhanced range of Fv/Fm, Fv/Fo and OJIP parameters.

Rapid field screening Technical Specifications Fluorescence parameters are presented on the OS-30p+ large, colour, graphic display together with a logarithmic time scale presentation of the Kautsky curve. Previous measurements may be reviewed in the field. Up to 160,000 data sets and hundreds of experimental traces can be stored in the internal memory. Up to 32 OJIP graphs may be viewed and overlayed on the colour graphic screen, using 16 different colours. Items supplied: OS-30p+ unit with integral fluorescence optical probe, 10 dark adaption leaf clips, battery charger, USB cable,...