The Ultrospec 20 colorimeter is a small, robust, easy to use instrument that has been designed with both the student user and “field” user in mind. It is ideal for teaching the principles of science and analysis in sixth form colleges and technical schools, as well as being rugged enough for measurements in, for example, remote location health clinics where simple diagnostic tests need to be made. Spillages can be wiped from the smooth surface. The instrument has rechargeable batteries that are automatically charged when it is connected to the mains; it can be used for almost 1 month under normal operating conditions when fully charged, offering great flexibility. The instrument measures in absorbance and % transmission mode as well as in simple kinetics, enabling changes in absorbance over time and reaction rates to be determined (readings are taken approx. every second). It can be used in the 400 – 700 nm wavelength range as it has an integral, colour coded rotating wheel containing filters at 440, 470, 490, 520, 550, 580, 590 and 680nm. These are made from coloured gelatin and are encased in glass, enabling the instrument to be used in “tropical” conditions. A filter is selected by moving the wheel until the required wavelength is displayed in the window above the cell compartment. The instrument can be linked via a serial lead to either a serial printer for hardcopy output or to a PC for download of results to spreadsheet. It has an analogue output, and can also be connected to a chart recorder using the standard 2 x 4 mm banana plug sockets to output absorbance time data when in kinetics mode.
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