The Y(II) meter was designed to provide an inexpensive way to measure the fast light adapted Y(II) or ΔF/FM' protocol and to make it available to more people that need it.
Opti-Sciences developed a system that does not require expensive fiber optics, but still follows the proven methods needed for reliable plant stress measurement. Y(II) is measured from the top of the leaf along with PAR or photosynthetically active radiation. Furthermore, leaf temperature is measured from the bottom over a large area, allowing a more reliable value.
Measures the light adapted Y(II) protocol with an FM' correction option, PAR, ETR, Leaf temp, & Leaf absorptance.