The CFM-3 Chlorophyll Fluorescence module is an optional accessory for use with the PLC3 Universal Leaf Cuvette only. It is capable of both independent measurement of chlorophyll fluorescence and simultaneous measurement of photosynthesis and chlorophyll fluorescence. The CFM-3 is compact and elegantly designed with all light sources and fluorescence detection capability built directly into the light unit. The CFM-3 can be used as an actinic light source for leaf gas exchange and as a pulse-amplitude modulated (PAM) fluorometer for measurement of chlorophyll fluorescence on both dark and light adapted vegetation. The CFM-3 is capable of delivering saturating pulses up to 10000 µmol m-2 s-1 which is extremely useful in accommodating a wider range of ambient light conditions. The system is also capable of producing a “Multiphase flash” allowing for estimation of apparent Fm‘. Measured and Calculated Fluorescence Parameters