Test for stress caused by drought, lack of nutrients, light, heat, cold, herbicides, pesticides, CO2 levels, and disease. Direct read out and graphic display of Fv/Fm, Fo, Fm, Fod or (Fo´), qP, qN, NPQ, qT, qE, qI, qL, Y(NPQ), Y(NO), PAR, Leaf Temperature, ETR, Yield of (ΔF/Fm’), Fs of (F), Fms or (Fm´), advanced Lake and Puddle modes and user scripted protocols. Designed for today's most comprehensive stress measuring capability and user scripted protocols. For the most comprehensive stress measuring capability.