A photometer readhead is used to measure concentrations within a test sample of preselected color-developed analytes having different characteristic absorption bands. The photometer readhead comprises an artificial light source for illuminating the test sample, a plurality of light-emitting diodes for...http://www.google.es/patents/US5477326?utm_source=gb-gplus-sharePatente US5477326 - Spectrophotometer arrangement with multi-detector readhead
Spectrophotometer arrangement with multi-detector readhead
