The Varian Eclipse Fluorescence instrument incorporates the latest optical and electronic technology to provide excellent sensitivity and ease of use. The instrument covers the wavelength range 200-900 nm in excitation and emission, and is capable of fluorescence, phosphorescence and chemi/bio luminescence experiments. Accessories include a multi-cell temperature control unit (0-100 °C), a fibre optics dip probe for in situ measurement of samples in beakers or flasks, and a stopped flow system with rapid (8 ms) mixing, for fast kinetic experiments.