6025 Fluorescence Chlorophyll Probe Assembly Features: LED light source 465 nm emission Automatic, self-cleaning, mechanical wiper Photodetector picks up "fluorescence" at 680 nm wavelength Specifications: Range: 0-200 microgram/L as chlorophyll 0-100% as fluorescence Resolution: 0.1 microgram/L Chl; 0.1% FS Operating Pressure: 66 meters (216 feet) Operating Temperature: -5 to 45�C